diff --git a/Makefile.linux-gcc b/Makefile.linux-gcc
index ad5d4dd093..fe7349ad46 100644
--- a/Makefile.linux-gcc
+++ b/Makefile.linux-gcc
@@ -22,12 +22,6 @@ TOP = ../sqlite
 BCC = gcc -g -O0
 #BCC = /opt/ancic/bin/c89 -0
 
-#### If the target operating system supports the "usleep()" system
-#    call, then define the HAVE_USLEEP macro for all C modules.
-#
-#USLEEP = 
-USLEEP = -DHAVE_USLEEP=1
-
 #### If you want the SQLite library to be safe for use within a 
 #    multi-threaded program, then define the following macro
 #    appropriately:
diff --git a/ext/fts5/fts5.h b/ext/fts5/fts5.h
index 081e534f3f..2309460f02 100644
--- a/ext/fts5/fts5.h
+++ b/ext/fts5/fts5.h
@@ -263,7 +263,7 @@ struct Fts5PhraseIter {
 **   See xPhraseFirstColumn above.
 */
 struct Fts5ExtensionApi {
-  int iVersion;                   /* Currently always set to 3 */
+  int iVersion;                   /* Currently always set to 2 */
 
   void *(*xUserData)(Fts5Context*);
 
@@ -541,7 +541,7 @@ struct fts5_api {
   int (*xCreateTokenizer)(
     fts5_api *pApi,
     const char *zName,
-    void *pContext,
+    void *pUserData,
     fts5_tokenizer *pTokenizer,
     void (*xDestroy)(void*)
   );
@@ -550,7 +550,7 @@ struct fts5_api {
   int (*xFindTokenizer)(
     fts5_api *pApi,
     const char *zName,
-    void **ppContext,
+    void **ppUserData,
     fts5_tokenizer *pTokenizer
   );
 
@@ -558,7 +558,7 @@ struct fts5_api {
   int (*xCreateFunction)(
     fts5_api *pApi,
     const char *zName,
-    void *pContext,
+    void *pUserData,
     fts5_extension_function xFunction,
     void (*xDestroy)(void*)
   );
diff --git a/ext/fts5/fts5_index.c b/ext/fts5/fts5_index.c
index e46840c2e8..9d80e79e56 100644
--- a/ext/fts5/fts5_index.c
+++ b/ext/fts5/fts5_index.c
@@ -4752,7 +4752,7 @@ static int fts5IndexFindDeleteMerge(Fts5Index *p, Fts5Structure *pStruct){
         nEntry += pLvl->aSeg[iSeg].nEntry;
         nTomb += pLvl->aSeg[iSeg].nEntryTombstone;
       }
-      assert( nEntry>0 || pLvl->nSeg==0 );
+      assert_nc( nEntry>0 || pLvl->nSeg==0 );
       if( nEntry>0 ){
         int nPercent = (nTomb * 100) / nEntry;
         if( nPercent>=pConfig->nDeleteMerge && nPercent>nBest ){
@@ -8092,15 +8092,16 @@ static int fts5structCloseMethod(sqlite3_vtab_cursor *cur){
 */
 static int fts5structNextMethod(sqlite3_vtab_cursor *cur){
   Fts5StructVcsr *pCsr = (Fts5StructVcsr*)cur;
+  Fts5Structure *p = pCsr->pStruct;
 
   assert( pCsr->pStruct );
   pCsr->iSeg++;
   pCsr->iRowid++;
-  while( pCsr->iSeg>=pCsr->pStruct->aLevel[pCsr->iLevel].nSeg ){
+  while( pCsr->iLevel<p->nLevel && pCsr->iSeg>=p->aLevel[pCsr->iLevel].nSeg ){
     pCsr->iLevel++;
     pCsr->iSeg = 0;
   }
-  if( pCsr->iLevel>=pCsr->pStruct->nLevel ){
+  if( pCsr->iLevel>=p->nLevel ){
     fts5StructureRelease(pCsr->pStruct);
     pCsr->pStruct = 0;
   }
diff --git a/ext/fts5/fts5_main.c b/ext/fts5/fts5_main.c
index d1c79d3604..c34a5a332b 100644
--- a/ext/fts5/fts5_main.c
+++ b/ext/fts5/fts5_main.c
@@ -1689,7 +1689,7 @@ static int fts5UpdateMethod(
     ** VIRTUAL TABLE statement contained "contentless_delete=1". */
     if( eType0==SQLITE_INTEGER 
      && pConfig->eContent==FTS5_CONTENT_NONE 
-     && (nArg>1 || pConfig->bContentlessDelete==0)
+     && pConfig->bContentlessDelete==0
     ){
       pTab->p.base.zErrMsg = sqlite3_mprintf(
           "cannot %s contentless fts5 table: %s", 
@@ -2544,6 +2544,12 @@ static int fts5ColumnMethod(
       sqlite3_result_value(pCtx, sqlite3_column_value(pCsr->pStmt, iCol+1));
     }
     pConfig->pzErrmsg = 0;
+  }else if( pConfig->bContentlessDelete && sqlite3_vtab_nochange(pCtx) ){
+    char *zErr = sqlite3_mprintf("cannot UPDATE a subset of "
+        "columns on fts5 contentless-delete table: %s", pConfig->zName
+    );
+    sqlite3_result_error(pCtx, zErr, -1);
+    sqlite3_free(zErr);
   }
   return rc;
 }
diff --git a/ext/fts5/test/fts5contentless.test b/ext/fts5/test/fts5contentless.test
index 41a78e9c8f..f75ccb44c2 100644
--- a/ext/fts5/test/fts5contentless.test
+++ b/ext/fts5/test/fts5contentless.test
@@ -188,11 +188,11 @@ do_execsql_test 5.2 {
 
 do_catchsql_test 5.3 {
   UPDATE ft SET x='four six' WHERE rowid=3
-} {1 {cannot UPDATE contentless fts5 table: ft}}
+} {0 {}}
 
 do_execsql_test 5.4 {
   SELECT rowid FROM ft('one');
-} {1 3 4 5}
+} {1 4 5}
 
 do_execsql_test 5.5 {
   REPLACE INTO ft(rowid, x) VALUES(3, 'four six');
diff --git a/ext/fts5/test/fts5contentless5.test b/ext/fts5/test/fts5contentless5.test
new file mode 100644
index 0000000000..1541b0c68d
--- /dev/null
+++ b/ext/fts5/test/fts5contentless5.test
@@ -0,0 +1,59 @@
+# 2023 August 7
+#
+# The author disclaims copyright to this source code.  In place of
+# a legal notice, here is a blessing:
+#
+#    May you do good and not evil.
+#    May you find forgiveness for yourself and forgive others.
+#    May you share freely, never taking more than you give.
+#
+#***********************************************************************
+#
+# This file contains tests for the content= and content_rowid= options.
+#
+
+source [file join [file dirname [info script]] fts5_common.tcl]
+set testprefix fts5contentless5
+
+# If SQLITE_ENABLE_FTS5 is defined, omit this file.
+ifcapable !fts5 {
+  finish_test
+  return
+}
+
+do_execsql_test 1.0 {
+  CREATE VIRTUAL TABLE t1 USING fts5(a, b, c, content='', contentless_delete=1);
+  INSERT INTO t1 VALUES('A', 'B', 'C');
+  INSERT INTO t1 VALUES('D', 'E', 'F');
+  INSERT INTO t1 VALUES('G', 'H', 'I');
+}
+
+do_execsql_test 1.01 {
+  CREATE TABLE t2(x, y);
+  INSERT INTO t2 VALUES('x', 'y');
+}
+
+# explain_i "UPDATE t1 SET a='a' WHERE t1.rowid=1"    
+breakpoint
+explain_i "UPDATE t1 SET a='a' FROM t2 WHERE t1.rowid=1 AND b IS NULL"     
+
+#breakpoint
+#explain_i "UPDATE t1 SET a='a' WHERE b IS NULL AND rowid=?"
+
+foreach {tn up err} {
+  1   "UPDATE t1 SET a='a', b='b', c='c' WHERE rowid=1"                  0
+  2   "UPDATE t1 SET a='a', b='b'        WHERE rowid=1"                  1
+  3   "UPDATE t1 SET        b='b', c='c' WHERE rowid=1"                  1
+  4   "UPDATE t1 SET a='a',        c='c' WHERE rowid=1"                  1
+  5   "UPDATE t1 SET a='a',        c='c' WHERE t1.rowid=1 AND b IS NULL" 1
+  6   "UPDATE t1 SET a='a' FROM t2 WHERE t1.rowid=1"                     1
+  7   "UPDATE t1 SET a='a', b='b', c='c' FROM t2 WHERE t1.rowid=1"       0
+} {
+
+  set res(0) {0 {}}
+  set res(1) {1 {cannot UPDATE a subset of columns on fts5 contentless-delete table: t1}}
+  do_catchsql_test 1.$tn $up $res($err)
+}
+
+finish_test
+
diff --git a/ext/wasm/api/extern-post-js.c-pp.js b/ext/wasm/api/extern-post-js.c-pp.js
index 00cb3fab90..63e55051c6 100644
--- a/ext/wasm/api/extern-post-js.c-pp.js
+++ b/ext/wasm/api/extern-post-js.c-pp.js
@@ -62,6 +62,7 @@ const toExportForESM =
   globalThis.sqlite3InitModule = function ff(...args){
     //console.warn("Using replaced sqlite3InitModule()",globalThis.location);
     return originalInit(...args).then((EmscriptenModule)=>{
+//#if wasmfs
       if('undefined'!==typeof WorkerGlobalScope &&
          EmscriptenModule['ENVIRONMENT_IS_PTHREAD']){
         /** Workaround for wasmfs-generated worker, which calls this
@@ -72,6 +73,7 @@ const toExportForESM =
         //console.warn("sqlite3InitModule() returning E-module.",EmscriptenModule);
         return EmscriptenModule;
       }
+//#endif
       //console.warn("sqlite3InitModule() returning sqlite3 object.");
       const s = EmscriptenModule.sqlite3;
       s.scriptInfo = initModuleState;
diff --git a/ext/wasm/api/sqlite3-api-prologue.js b/ext/wasm/api/sqlite3-api-prologue.js
index 0179091c02..3b29041c37 100644
--- a/ext/wasm/api/sqlite3-api-prologue.js
+++ b/ext/wasm/api/sqlite3-api-prologue.js
@@ -1645,7 +1645,8 @@ globalThis.sqlite3ApiBootstrap = function sqlite3ApiBootstrap(
          do not.
       */
       tgt.push(capi.sqlite3_value_to_js(
-        wasm.peekPtr(pArgv + (wasm.ptrSizeof * i))
+        wasm.peekPtr(pArgv + (wasm.ptrSizeof * i)),
+        throwIfCannotConvert
       ));
     }
     return tgt;
diff --git a/ext/wasm/api/sqlite3-vfs-opfs-sahpool.c-pp.js b/ext/wasm/api/sqlite3-vfs-opfs-sahpool.c-pp.js
index ee8d1a5d68..709d3414c3 100644
--- a/ext/wasm/api/sqlite3-vfs-opfs-sahpool.c-pp.js
+++ b/ext/wasm/api/sqlite3-vfs-opfs-sahpool.c-pp.js
@@ -854,17 +854,24 @@ globalThis.sqlite3ApiBootstrap.initializers.push(function(sqlite3){
       return true;
     }
 
+
     //! Documented elsewhere in this file.
     exportFile(name){
       const sah = this.#mapFilenameToSAH.get(name) || toss("File not found:",name);
       const n = sah.getSize() - HEADER_OFFSET_DATA;
-      const b = new Uint8Array(n>=0 ? n : 0);
-      if(n>0) sah.read(b, {at: HEADER_OFFSET_DATA});
+      const b = new Uint8Array(n>0 ? n : 0);
+      if(n>0){
+        const nRead = sah.read(b, {at: HEADER_OFFSET_DATA});
+        if(nRead != n){
+          toss("Expected to read "+n+" bytes but read "+nRead+".");
+        }
+      }
       return b;
     }
 
     //! Documented elsewhere in this file.
     importDb(name, bytes){
+      if(bytes instanceof ArrayBuffer) bytes = new Uint8Array(bytes);
       const n = bytes.byteLength;
       if(n<512 || n%512!=0){
         toss("Byte array size is invalid for an SQLite db.");
@@ -878,8 +885,13 @@ globalThis.sqlite3ApiBootstrap.initializers.push(function(sqlite3){
       const sah = this.#mapFilenameToSAH.get(name)
             || this.nextAvailableSAH()
             || toss("No available handles to import to.");
-      sah.write(bytes, {at: HEADER_OFFSET_DATA});
-      this.setAssociatedPath(sah, name, capi.SQLITE_OPEN_MAIN_DB);
+      const nWrote = sah.write(bytes, {at: HEADER_OFFSET_DATA});
+      if(nWrote != n){
+        this.setAssociatedPath(sah, '', 0);
+        toss("Expected to write "+n+" bytes but wrote "+nWrote+".");
+      }else{
+        this.setAssociatedPath(sah, name, capi.SQLITE_OPEN_MAIN_DB);
+      }
     }
 
   }/*class OpfsSAHPool*/;
@@ -1074,16 +1086,20 @@ globalThis.sqlite3ApiBootstrap.initializers.push(function(sqlite3){
      Returns an array of the names of the files currently allocated to
      slots. This list is the same length as getFileCount().
 
-     - void importDb(name, byteArray)
+     - void importDb(name, bytes)
 
      Imports the contents of an SQLite database, provided as a byte
-     array, under the given name, overwriting any existing
-     content. Throws if the pool has no available file slots, on I/O
-     error, or if the input does not appear to be a database. In the
-     latter case, only a cursory examination is made.  Note that this
-     routine is _only_ for importing database files, not arbitrary files,
-     the reason being that this VFS will automatically clean up any
-     non-database files so importing them is pointless.
+     array or ArrayBuffer, under the given name, overwriting any
+     existing content. Throws if the pool has no available file slots,
+     on I/O error, or if the input does not appear to be a
+     database. In the latter case, only a cursory examination is made.
+     Note that this routine is _only_ for importing database files,
+     not arbitrary files, the reason being that this VFS will
+     automatically clean up any non-database files so importing them
+     is pointless.
+
+     On a write error, the handle is removed from the pool and made
+     available for re-use.
 
      - [async] number reduceCapacity(n)
 
diff --git a/ext/wasm/common/whwasmutil.js b/ext/wasm/common/whwasmutil.js
index ee7ea20c34..0437ef35d8 100644
--- a/ext/wasm/common/whwasmutil.js
+++ b/ext/wasm/common/whwasmutil.js
@@ -613,8 +613,6 @@ globalThis.WhWasmUtilInstaller = function(target){
   target.installFunction = (func, sig)=>__installFunction(func, sig, false);
 
   /**
-     EXPERIMENTAL! DO NOT USE IN CLIENT CODE!
-
      Works exactly like installFunction() but requires that a
      scopedAllocPush() is active and uninstalls the given function
      when that alloc scope is popped via scopedAllocPop().
@@ -1180,7 +1178,7 @@ globalThis.WhWasmUtilInstaller = function(target){
     cache.scopedAlloc.splice(n,1);
     for(let p; (p = state.pop()); ){
       if(target.functionEntry(p)){
-        //console.warn("scopedAllocPop() uninstalling transient function",p);
+        //console.warn("scopedAllocPop() uninstalling function",p);
         target.uninstallFunction(p);
       }
       else target.dealloc(p);
@@ -1637,6 +1635,7 @@ globalThis.WhWasmUtilInstaller = function(target){
                      'and is not intended to be invoked from',
                      'client-level code. Invoked with:',opt);
       }
+      this.name = opt.name || "unnamed";
       this.signature = opt.signature;
       if(opt.contextKey instanceof Function){
         this.contextKey = opt.contextKey;
@@ -1698,14 +1697,16 @@ globalThis.WhWasmUtilInstaller = function(target){
        exactly the 2nd and 3rd arguments are.
     */
     convertArg(v,argv,argIndex){
-      //FuncPtrAdapter.debugOut("FuncPtrAdapter.convertArg()",this.signature,this.transient,v);
+      //FuncPtrAdapter.debugOut("FuncPtrAdapter.convertArg()",this.name,this.signature,this.transient,v);
       let pair = this.singleton;
       if(!pair && this.isContext){
         pair = this.contextMap(this.contextKey(argv,argIndex));
+        //FuncPtrAdapter.debugOut(this.name, this.signature, "contextKey() =",this.contextKey(argv,argIndex), pair);
       }
       if(pair && pair[0]===v) return pair[1];
       if(v instanceof Function){
         /* Install a WASM binding and return its pointer. */
+        //FuncPtrAdapter.debugOut("FuncPtrAdapter.convertArg()",this.name,this.signature,this.transient,v,pair);
         if(this.callProxy) v = this.callProxy(v);
         const fp = __installFunction(v, this.signature, this.isTransient);
         if(FuncPtrAdapter.debugFuncInstall){
@@ -1719,7 +1720,18 @@ globalThis.WhWasmUtilInstaller = function(target){
               FuncPtrAdapter.debugOut("FuncPtrAdapter uninstalling", this,
                                       this.contextKey(argv,argIndex), '@'+pair[1], v);
             }
-            try{target.uninstallFunction(pair[1])}
+            try{
+              /* Because the pending native call might rely on the
+                 pointer we're replacing, e.g. as is normally the case
+                 with sqlite3's xDestroy() methods, we don't
+                 immediately uninstall but instead add its pointer to
+                 the scopedAlloc stack, which will be cleared when the
+                 xWrap() mechanism is done calling the native
+                 function. We're relying very much here on xWrap()
+                 having pushed an alloc scope.
+              */
+              cache.scopedAlloc[cache.scopedAlloc.length-1].push(pair[1]);
+            }
             catch(e){/*ignored*/}
           }
           pair[0] = v;
@@ -1727,13 +1739,14 @@ globalThis.WhWasmUtilInstaller = function(target){
         }
         return fp;
       }else if(target.isPtr(v) || null===v || undefined===v){
+        //FuncPtrAdapter.debugOut("FuncPtrAdapter.convertArg()",this.name,this.signature,this.transient,v,pair);
         if(pair && pair[1] && pair[1]!==v){
           /* uninstall stashed mapping and replace stashed mapping with v. */
           if(FuncPtrAdapter.debugFuncInstall){
             FuncPtrAdapter.debugOut("FuncPtrAdapter uninstalling", this,
                                     this.contextKey(argv,argIndex), '@'+pair[1], v);
           }
-          try{target.uninstallFunction(pair[1])}
+          try{ cache.scopedAlloc[cache.scopedAlloc.length-1].push(pair[1]) }
           catch(e){/*ignored*/}
           pair[0] = pair[1] = (v | 0);
         }
diff --git a/ext/wasm/fiddle.make b/ext/wasm/fiddle.make
index cbe6ab3518..57141d7e2b 100644
--- a/ext/wasm/fiddle.make
+++ b/ext/wasm/fiddle.make
@@ -18,7 +18,7 @@ endif
 ifeq (,$(SHELL_SRC))
 $(error Could not parse SHELL_SRC from $(dir.top)/Makefile.)
 endif
-$(dir.top)/shell.c: $(SHELL_SRC) $(dir.top)/tool/mkshellc.tcl
+$(dir.top)/shell.c: $(SHELL_SRC) $(dir.top)/tool/mkshellc.tcl $(sqlite3.c)
 	$(MAKE) -C $(dir.top) shell.c
 # /shell.c
 ########################################################################
@@ -61,9 +61,9 @@ $(fiddle.SOAP.js): $(SOAP.js)
 $(eval $(call call-make-pre-post,fiddle-module,vanilla))
 $(fiddle-module.js): $(MAKEFILE) $(MAKEFILE.fiddle) \
     $(EXPORTED_FUNCTIONS.fiddle) \
-    $(fiddle.cses) $(pre-post-fiddle-module.deps.vanilla) $(fiddle.SOAP.js)
+    $(fiddle.cses) $(pre-post-fiddle-module-vanilla.deps) $(fiddle.SOAP.js)
 	$(emcc.bin) -o $@ $(fiddle.emcc-flags) \
-    $(pre-post-fiddle-module.flags.vanilla) \
+    $(pre-post-fiddle-module-vanilla.flags) \
     $(fiddle.cses)
 	$(maybe-wasm-strip) $(fiddle-module.wasm)
 	gzip < $@ > $@.gz
diff --git a/ext/wasm/fiddle/fiddle-worker.js b/ext/wasm/fiddle/fiddle-worker.js
index e239cbf51e..67f61008fb 100644
--- a/ext/wasm/fiddle/fiddle-worker.js
+++ b/ext/wasm/fiddle/fiddle-worker.js
@@ -221,7 +221,7 @@
       f._();
     }
   };
-  
+
   self.onmessage = function f(ev){
     ev = ev.data;
     if(!f.cache){
@@ -371,12 +371,14 @@
   sqlite3InitModule(fiddleModule).then((_sqlite3)=>{
     sqlite3 = _sqlite3;
     console.warn("Installing sqlite3 module globally (in Worker)",
-                 "for use in the dev console.");
-    self.sqlite3 = sqlite3;
+                 "for use in the dev console.", sqlite3);
+    globalThis.sqlite3 = sqlite3;
     const dbVfs = sqlite3.wasm.xWrap('fiddle_db_vfs', "*", ['string']);
     fiddleModule.fsUnlink = (fn)=>{
       return sqlite3.wasm.sqlite3_wasm_vfs_unlink(dbVfs(0), fn);
     };
     wMsg('fiddle-ready');
-  })/*then()*/;
+  }).catch(e=>{
+    console.error("Fiddle worker init failed:",e);
+  });
 })();
diff --git a/ext/wasm/tester1.c-pp.js b/ext/wasm/tester1.c-pp.js
index db4b50f4b6..c1b16d5e81 100644
--- a/ext/wasm/tester1.c-pp.js
+++ b/ext/wasm/tester1.c-pp.js
@@ -353,7 +353,7 @@ globalThis.sqlite3InitModule = sqlite3InitModule;
   const sahPoolConfig = {
     name: 'opfs-sahpool-tester1',
     clearOnInit: true,
-    initialCapacity: 3
+    initialCapacity: 6
   };
   ////////////////////////////////////////////////////////////////////////
   // End of infrastructure setup. Now define the tests...
@@ -3076,7 +3076,24 @@ globalThis.sqlite3InitModule = sqlite3InitModule;
         T.assert(1 === fileNames.length)
           .assert(dbName === fileNames[0])
           .assert(1 === u1.getFileCount())
-          .assert(true === u1.unlink(dbName))
+
+        if(1){ // test exportFile() and importDb()
+          const dbytes = u1.exportFile(dbName);
+          T.assert(dbytes.length >= 4096);
+          const dbName2 = '/exported.db';
+          u1.importDb(dbName2, dbytes);
+          T.assert( 2 == u1.getFileCount() );
+          let db2 = new u1.OpfsSAHPoolDb(dbName2);
+          T.assert(db2 instanceof sqlite3.oo1.DB)
+            .assert(3 === db2.selectValue('select count(*) from t'));
+          db2.close();
+          T.assert(true === u1.unlink(dbName2))
+            .assert(false === u1.unlink(dbName2))
+            .assert(1 === u1.getFileCount())
+            .assert(1 === u1.getFileNames().length);
+        }
+
+        T.assert(true === u1.unlink(dbName))
           .assert(false === u1.unlink(dbName))
           .assert(0 === u1.getFileCount())
           .assert(0 === u1.getFileNames().length);
@@ -3089,6 +3106,7 @@ globalThis.sqlite3InitModule = sqlite3InitModule;
         log("Installed second SAH instance as",conf2.name);
         T.assert(0 === POther.getFileCount())
           .assert(true === await POther.removeVfs());
+
         if(0){
            /* Enable this block to inspect vfs's contents via the dev
               console or OPFS Explorer browser extension.  The
diff --git a/manifest b/manifest
index b37cc822ec..bcbb0a69ea 100644
--- a/manifest
+++ b/manifest
@@ -1,10 +1,10 @@
-C Merge\sthe\slatest\strunk\senhancements\sinto\sthe\swal-shm-exceptions\sbranch.
-D 2023-07-28T19:07:25.753
+C Merge\slatest\strunk\schanges\sinto\sthis\sbranch.
+D 2023-08-10T17:07:34.643
 F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
 F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
 F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
 F Makefile.in 0f4cb3955aaff8a40ec3857ba1784bd98b69802e51eff979f874b65713b627b2
-F Makefile.linux-gcc f609543700659711fbd230eced1f01353117621dccae7b9fb70daa64236c5241
+F Makefile.linux-gcc f3842a0b1efbfbb74ac0ef60e56b301836d05b4d867d014f714fa750048f1ab6
 F Makefile.msc daad4a19e0b3c3c3b79b64d4ddbf75e3f506405e8d3f3f604d6f48b26043c51f
 F README.md c1c4218efcc4071a6e26db2b517fdbc1035696a29b370edd655faddbef02b224
 F VERSION c6366dc72582d3144ce87b013cc35fe48d62f6d07d5be0c9716ea33c862144aa
@@ -85,15 +85,15 @@ F ext/fts3/unicode/UnicodeData.txt cd07314edb62d49fde34debdaf92fa2aa69011e7
 F ext/fts3/unicode/mkunicode.tcl d5aebf022fa4577ee8cdf27468f0d847879993959101f6dbd6348ef0cfc324a7
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@@ -584,7 +585,7 @@ F src/bitvec.c 9eac5f42c11914d5ef00a75605bb205e934f435c579687f985f1f8b0995c8645
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-F src/util.c 987e31e45aa9a7f206b8b86b0d09dd440263b869b627931a8dace5f39638e698
+F src/util.c a40062117e705eb3339201842717a022092816b92479eead6397cde28af32ff9
 F src/vacuum.c 604fcdaebe76f3497c855afcbf91b8fa5046b32de3045bab89cc008d68e40104
-F src/vdbe.c cd0396758da6a95e6c4e3bec7c3d6e767c3b39930c295c2425f83bb086cdc6ba
+F src/vdbe.c 346d848a0bf8128e3e3722c5406f4bde6c32d7093b93402c6f8e0718d19305c3
 F src/vdbe.h 41485521f68e9437fdb7ec4a90f9d86ab294e9bb8281e33b235915e29122cfc0
-F src/vdbeInt.h cd829ff67fc18aff2476fe3209262ba8671cb43d51cb6913de4a670e37d2fbe3
-F src/vdbeapi.c 0cba9fe6e860e46bfb5e45a76a8c2c6ccd5ebc8f954319e4288e7793c2eca88c
+F src/vdbeInt.h 949669dfd8a41550d27dcb905b494f2ccde9a2e6c1b0b04daa1227e2e74c2b2c
+F src/vdbeapi.c f37822f215740ede2a8fcae99bc13f2cc3a72dd0e1d22b81b9298c5ca67dbc38
 F src/vdbeaux.c e3aa5c46827cd95e0fc4d0f302fa3e901ab5f07258fdbb42709eeef40f63018d
 F src/vdbeblob.c 2516697b3ee8154eb8915f29466fb5d4f1ae39ee8b755ea909cefaf57ec5e2ce
-F src/vdbemem.c adb5877dc54330865e45e0fba50f6455c1d9d8b83434c59f0e3d2d2a0b9f0e58
+F src/vdbemem.c 317b9f48708139db6239ade40c7980b4bc8233168383690d588dad6d8437f722
 F src/vdbesort.c 0d40dca073c94e158ead752ef4225f4fee22dee84145e8c00ca2309afb489015
 F src/vdbetrace.c fe0bc29ebd4e02c8bc5c1945f1d2e6be5927ec12c06d89b03ef2a4def34bf823
 F src/vdbevtab.c 57fa8f56478e5b5cb558cb425e7878515e0a105c54f96f1d1bbf4b9433529254
@@ -728,7 +729,7 @@ F src/vxworks.h d2988f4e5a61a4dfe82c6524dd3d6e4f2ce3cdb9
 F src/wal.c 02e10f033a6972bc7d50122b400318003199c504cda48f61ad404564505f4e89
 F src/wal.h 04a9e53121d5076f2a173b0f2facb39d33047093fee71bd3bbe6b1f6f1f5fd4b
 F src/walker.c 7c7ea0115345851c3da4e04e2e239a29983b61fb5b038b94eede6aba462640e2
-F src/where.c 477fcc5e561ef169e6002499602af6b805156c2aae6b2f5c2c93ef8c1cd64768
+F src/where.c b8917792f1e0dbfa28fb29e6cd3d560060d69667be0ba4c491cbc772363264f5
 F src/whereInt.h c7d19902863beadec1d04e66aca39c0bcd60b74f05f0eaa7422c7005dfc5d51a
 F src/wherecode.c 5d77db30a2a3dd532492ae882de114edba2fae672622056b1c7fd61f5917a8f1
 F src/whereexpr.c dc5096eca5ed503999be3bdee8a90c51361289a678d396a220912e9cb73b3c00
@@ -909,7 +910,7 @@ F test/corruptH.test 79801d97ec5c2f9f3c87739aa1ec2eb786f96454
 F test/corruptI.test 9d8cbf6214e492abe9e822e759b9751ae336cec0a6fe3ff3b37bfbd8ff9c22ca
 F test/corruptJ.test 4d5ccc4bf959464229a836d60142831ef76a5aa4
 F test/corruptK.test 5b4212fe346699831c5ad559a62c54e11c0611bdde1ea8423a091f9c01aa32af
-F test/corruptL.test b42978028afc5eefc8b51d8d7cd6a9344ba7362d7ed4511ee2070f56e06d5a1c
+F test/corruptL.test 504d90502d9993440226edc355d2275524b89064ea3df5ee5c27f7028ec59d07
 F test/corruptM.test 7d574320e08c1b36caa3e47262061f186367d593a7e305d35f15289cc2c3e067
 F test/corruptN.test 7c099d153a554001b4fb829c799b01f2ea6276cbc32479131e0db0da4efd9cc4
 F test/cost.test b11cdbf9f11ffe8ef99c9881bf390e61fe92baf2182bad1dbe6de59a7295c576
@@ -1138,7 +1139,7 @@ F test/fuzzdata4.db b502c7d5498261715812dd8b3c2005bad08b3a26e6489414bd13926cd3e4
 F test/fuzzdata5.db e35f64af17ec48926481cfaf3b3855e436bd40d1cfe2d59a9474cb4b748a52a5
 F test/fuzzdata6.db b8725a5f5cf7a3b7241a9038e57ca7e7cc8c3f4d86b44bd770617bda245ab2b0
 F test/fuzzdata7.db 0166b56fd7a6b9636a1d60ef0a060f86ddaecf99400a666bb6e5bbd7199ad1f2
-F test/fuzzdata8.db f6c2f2af4deaaae0ddb3310d509c2659990794aa653dc501b80a0534c3493f80
+F test/fuzzdata8.db 40c85daae47da64387c3dab7bbd99c21e425c0bfdb4b149cb685b1ab474a2cb4
 F test/fuzzer1.test 3d4c4b7e547aba5e5511a2991e3e3d07166cfbb8
 F test/fuzzer2.test a85ef814ce071293bce1ad8dffa217cbbaad4c14
 F test/fuzzerfault.test f64c4aef4c9e9edf1d6dc0d3f1e65dcc81e67c996403c88d14f09b74807a42bc
@@ -1233,7 +1234,7 @@ F test/json/json-generator.tcl dc0dd0f393800c98658fc4c47eaa6af29d4e17527380cd286
 F test/json/json-q1.txt 65f9d1cdcc4cffa9823fb73ed936aae5658700cd001fde448f68bfb91c807307
 F test/json/json-speed-check.sh 8b7babf530faa58bd59d6d362cec8e9036a68c5457ff46f3b1f1511d21af6737 x
 F test/json101.test 94126d4291d4a00e45f6988ce885c410de69243490e46e70e9946cb6e6f9ea02
-F test/json102.test 13dc9e7b7f359ecb861e02f9bd7019f7342a63d1c354273b0a8f3904050560a8
+F test/json102.test 24f6f204f9cde45b971016691d0b92a9b4c58040d699e36d6b12cb165f9083ff
 F test/json103.test 53df87f83a4e5fa0c0a56eb29ff6c94055c6eb919f33316d62161a8880112dbe
 F test/json104.test 1b844a70cddcfa2e4cd81a5db0657b2e61e7f00868310f24f56a9ba0114348c1
 F test/json105.test 11670a4387f4308ae0318cadcbd6a918ea7edcd19fbafde020720a073952675d
@@ -1770,7 +1771,7 @@ F test/unique.test 93f8b2ef5ea51b9495f8d6493429b1fd0f465264
 F test/unique2.test 3674e9f2a3f1fbbfd4772ac74b7a97090d0f77d2
 F test/unixexcl.test d936ba2b06794018e136418addd59a2354eeae97
 F test/unordered.test 0edaf3411d300693bca595897c5201421c6c5ec787990a1dfe2f7f60ae93f1e2
-F test/update.test 90772ede84cfc779fc3d31884a84ec4c74deb501eeb09a1c6c91c03d8e94c0d8
+F test/update.test 85d3f46d0863033370bd881b1097f5694369a8730e53c5f85d96f32b7b310b47
 F test/update2.test 67455bc61fcbcf96923c45b3bc4f87bc72be7d67575ad35f134906148c7b06d3
 F test/upfrom1.tcl 8859d9d437f03b44174c4524a7a734a391fd4526fcff65be08285dafc9dc9041
 F test/upfrom1.test 8cb06689e99cd707d884faa16da0e8eb26ff658bb01c47ddf72fadade666e6e1
@@ -1872,7 +1873,7 @@ F test/where3.test 5b4ffc0ac2ea0fe92f02b1244b7531522fe4d7bccf6fa8741d54e82c10e67
 F test/where4.test 4a371bfcc607f41d233701bdec33ac2972908ba8
 F test/where5.test fdf66f96d29a064b63eb543e28da4dfdccd81ad2
 F test/where6.test 5da5a98cec820d488e82708301b96cb8c18a258b
-F test/where7.test 1c1bf436bf31b913d4764a2b62ac6e98b9681e5c7ae2b562605592a56b7e946b
+F test/where7.test 15041c7a5838f3bac98f3fb933709674a0b59367664e88fafaf105ff7416eb07
 F test/where8.test 461ca40265ed996a6305da99bb024b0e41602bb586acf544c08f95922358e49f
 F test/where9.test 2db942671a002621eff4f713e347bb25243295f79d8990297cd160bebcfde3f7
 F test/whereA.test 9d1077b117f1b68d5f739d94f36956c36cf995eb87bb19b77b2e81af020edd20
@@ -1946,7 +1947,7 @@ F tool/GetFile.cs 47852aa0d806fe47ed1ac5138bdce7f000fe87aaa7f28107d0cb1e26682aeb
 F tool/GetTclKit.bat d84033c6a93dfe735d247f48ba00292a1cc284dcf69963e5e672444e04534bbf
 F tool/Replace.cs 02c67258801c2fb5f63231e0ac0f220b4b36ba91
 F tool/build-all-msvc.bat c817b716e0edeecaf265a6775b63e5f45c34a6544f1d4114a222701ed5ac79ab x
-F tool/build-shell.sh 950f47c6174f1eea171319438b93ba67ff5bf367
+F tool/build-shell.sh f193b5e3eb4afcb4abbf96bf1475be6cfb74763ee2e50c82bc7ca105e8a136c5
 F tool/cg_anno.tcl c1f875f5a4c9caca3d59937b16aff716f8b1883935f1b4c9ae23124705bc8099 x
 F tool/checkSpacing.c 810e51703529a204fc4e1eb060e9ab663e3c06d2
 F tool/custom.txt 6cdf298f43e1db4bb91406d14777669b8fb1df790837823fa6754c4308decc27
@@ -1984,7 +1985,7 @@ F tool/mkshellc.tcl b7adf08b82de60811d2cb6af05ff59fc17e5cd6f3e98743c14eaaa3f8971
 F tool/mksourceid.c 36aa8020014aed0836fd13c51d6dc9219b0df1761d6b5f58ff5b616211b079b9
 F tool/mkspeedsql.tcl a1a334d288f7adfe6e996f2e712becf076745c97
 F tool/mksqlite3c-noext.tcl 4f7cfef5152b0c91920355cbfc1d608a4ad242cb819f1aea07f6d0274f584a7f
-F tool/mksqlite3c.tcl 44bc3bdb675a9e3a507f4d82575332bccd7e6f830a47c9aa29460ea2240593a9
+F tool/mksqlite3c.tcl 49e39b1e616abc92fd8c24445f2b0a38881825f764541e0026f72371f0d84b65
 F tool/mksqlite3h.tcl d391cff7cad0a372ee1406faee9ccc7dad9cb80a0c95cae0f73d10dd26e06762
 F tool/mksqlite3internalh.tcl eb994013e833359137eb53a55acdad0b5ae1049b
 F tool/mkvsix.tcl b9e0777a213c23156b6542842c238479e496ebf5
@@ -2027,7 +2028,7 @@ F tool/varint.c 5d94cb5003db9dbbcbcc5df08d66f16071aee003
 F tool/vdbe-compress.tcl 1dcb7632e57cf57105248029e6e162fddaf6c0fccb3bb9e6215603752c5a2d4a
 F tool/vdbe_profile.tcl 3ac5a4a9449f4baf77059358ea050db3e34395ccf59c5464d29b91746d5b961e
 F tool/warnings-clang.sh bbf6a1e685e534c92ec2bfba5b1745f34fb6f0bc2a362850723a9ee87c1b31a7
-F tool/warnings.sh ab651bb82586c43ff8b560beceac959735bf917b44c5e0f67ba3426e474f29f8
+F tool/warnings.sh 49a486c5069de041aedcbde4de178293e0463ae9918ecad7539eedf0ec77a139
 F tool/win/sqlite.vsix deb315d026cc8400325c5863eef847784a219a2f
 F vsixtest/App.xaml b76d3b48860e7454775c47ea38ffea9c4abe3e85
 F vsixtest/App.xaml.cpp 41158ee43269820136fa3bba00c0bd91b26cc38b650ee392aec2a8d823e54318
@@ -2050,8 +2051,8 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
 F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
 F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
 F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
-P 8e20354242d5f34a90b6c00d9034535ef6f6086ee4971230c7fd69985e2777d2 0443c0ef85f8f6f3efdee68bf59126c9459f08a58458756f8cbeeaf043d43a86
-R 23d78abe8cd936ba319106e904e535fb
-U drh
-Z b7ed01e121576b0b22bf35ed273ca0ab
+P c44fb4d06591ef4872f015aa9e81ce8b93a38bd9143cf20db38cbe5c77a0d71f aa6de539c09faa320b68c63659e602107145c4263fa680d5b40fe4d7d7ac4534
+R 306d4b3f8aa93e07edcdfd262b597d0d
+U dan
+Z d6eddbca55d948f45c2bde6455133439
 # Remove this line to create a well-formed Fossil manifest.
diff --git a/manifest.uuid b/manifest.uuid
index 9f22921b56..90cc22ad97 100644
--- a/manifest.uuid
+++ b/manifest.uuid
@@ -1 +1 @@
-c44fb4d06591ef4872f015aa9e81ce8b93a38bd9143cf20db38cbe5c77a0d71f
\ No newline at end of file
+3ed89c344fcb3b7ee8b764d95144643e42e053e1116150d6eda8355fbd6669df
\ No newline at end of file
diff --git a/src/btreeInt.h b/src/btreeInt.h
index 3e69206193..26a0bc6869 100644
--- a/src/btreeInt.h
+++ b/src/btreeInt.h
@@ -180,7 +180,7 @@
 **    0x81 0x00                 becomes  0x00000080
 **    0x82 0x00                 becomes  0x00000100
 **    0x80 0x7f                 becomes  0x0000007f
-**    0x8a 0x91 0xd1 0xac 0x78  becomes  0x12345678
+**    0x81 0x91 0xd1 0xac 0x78  becomes  0x12345678
 **    0x81 0x81 0x81 0x81 0x01  becomes  0x10204081
 **
 ** Variable length integers are used for rowids and to hold the number of
diff --git a/src/delete.c b/src/delete.c
index 641d1ae589..2baff5b3d4 100644
--- a/src/delete.c
+++ b/src/delete.c
@@ -525,7 +525,8 @@ void sqlite3DeleteFrom(
     if( pWInfo==0 ) goto delete_from_cleanup;
     eOnePass = sqlite3WhereOkOnePass(pWInfo, aiCurOnePass);
     assert( IsVirtual(pTab)==0 || eOnePass!=ONEPASS_MULTI );
-    assert( IsVirtual(pTab) || bComplex || eOnePass!=ONEPASS_OFF );
+    assert( IsVirtual(pTab) || bComplex || eOnePass!=ONEPASS_OFF
+            || OptimizationDisabled(db, SQLITE_OnePass) );
     if( eOnePass!=ONEPASS_SINGLE ) sqlite3MultiWrite(pParse);
     if( sqlite3WhereUsesDeferredSeek(pWInfo) ){
       sqlite3VdbeAddOp1(v, OP_FinishSeek, iTabCur);
diff --git a/src/expr.c b/src/expr.c
index 0c41f6684a..d96f362856 100644
--- a/src/expr.c
+++ b/src/expr.c
@@ -3972,10 +3972,13 @@ int sqlite3ExprCodeGetColumn(
   u8 p5            /* P5 value for OP_Column + FLAGS */
 ){
   assert( pParse->pVdbe!=0 );
+  assert( (p5 & (OPFLAG_NOCHNG|OPFLAG_TYPEOFARG|OPFLAG_LENGTHARG))==p5 );
+  assert( IsVirtual(pTab) || (p5 & OPFLAG_NOCHNG)==0 );
   sqlite3ExprCodeGetColumnOfTable(pParse->pVdbe, pTab, iTable, iColumn, iReg);
   if( p5 ){
     VdbeOp *pOp = sqlite3VdbeGetLastOp(pParse->pVdbe);
     if( pOp->opcode==OP_Column ) pOp->p5 = p5;
+    if( pOp->opcode==OP_VColumn ) pOp->p5 = (p5 & OPFLAG_NOCHNG);
   }
   return iReg;
 }
diff --git a/src/json.c b/src/json.c
index cc39264c05..fcaa9d84b9 100644
--- a/src/json.c
+++ b/src/json.c
@@ -30,25 +30,51 @@
 ** increase for the parser.  (Ubuntu14.10 gcc 4.8.4 x64 with -Os).
 */
 static const char jsonIsSpace[] = {
-  0, 0, 0, 0, 0, 0, 0, 0,     0, 1, 1, 0, 0, 1, 0, 0,
-  0, 0, 0, 0, 0, 0, 0, 0,     0, 0, 0, 0, 0, 0, 0, 0,
-  1, 0, 0, 0, 0, 0, 0, 0,     0, 0, 0, 0, 0, 0, 0, 0,
-  0, 0, 0, 0, 0, 0, 0, 0,     0, 0, 0, 0, 0, 0, 0, 0,
-  0, 0, 0, 0, 0, 0, 0, 0,     0, 0, 0, 0, 0, 0, 0, 0,
-  0, 0, 0, 0, 0, 0, 0, 0,     0, 0, 0, 0, 0, 0, 0, 0,
-  0, 0, 0, 0, 0, 0, 0, 0,     0, 0, 0, 0, 0, 0, 0, 0,
-  0, 0, 0, 0, 0, 0, 0, 0,     0, 0, 0, 0, 0, 0, 0, 0,
-  0, 0, 0, 0, 0, 0, 0, 0,     0, 0, 0, 0, 0, 0, 0, 0,
-  0, 0, 0, 0, 0, 0, 0, 0,     0, 0, 0, 0, 0, 0, 0, 0,
-  0, 0, 0, 0, 0, 0, 0, 0,     0, 0, 0, 0, 0, 0, 0, 0,
-  0, 0, 0, 0, 0, 0, 0, 0,     0, 0, 0, 0, 0, 0, 0, 0,
-  0, 0, 0, 0, 0, 0, 0, 0,     0, 0, 0, 0, 0, 0, 0, 0,
-  0, 0, 0, 0, 0, 0, 0, 0,     0, 0, 0, 0, 0, 0, 0, 0,
-  0, 0, 0, 0, 0, 0, 0, 0,     0, 0, 0, 0, 0, 0, 0, 0,
-  0, 0, 0, 0, 0, 0, 0, 0,     0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,  0, 1, 1, 0, 0, 1, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,  0, 0, 0, 0, 0, 0, 0, 0,
+  1, 0, 0, 0, 0, 0, 0, 0,  0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,  0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,  0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,  0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,  0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,  0, 0, 0, 0, 0, 0, 0, 0,
+
+  0, 0, 0, 0, 0, 0, 0, 0,  0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,  0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,  0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,  0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,  0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,  0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,  0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,  0, 0, 0, 0, 0, 0, 0, 0,
 };
 #define fast_isspace(x) (jsonIsSpace[(unsigned char)x])
 
+/*
+** Characters that are special to JSON.  Control charaters,
+** '"' and '\\'.
+*/
+static const char jsonIsOk[256] = {
+  0, 0, 0, 0, 0, 0, 0, 0,  0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,  0, 0, 0, 0, 0, 0, 0, 0,
+  1, 1, 0, 1, 1, 1, 1, 0,  1, 1, 1, 1, 1, 1, 1, 1,
+  1, 1, 1, 1, 1, 1, 1, 1,  1, 1, 1, 1, 1, 1, 1, 1,
+  1, 1, 1, 1, 1, 1, 1, 1,  1, 1, 1, 1, 1, 1, 1, 1,
+  1, 1, 1, 1, 1, 1, 1, 1,  1, 1, 1, 1, 0, 1, 1, 1,
+  1, 1, 1, 1, 1, 1, 1, 1,  1, 1, 1, 1, 1, 1, 1, 1,
+  1, 1, 1, 1, 1, 1, 1, 1,  1, 1, 1, 1, 1, 1, 1, 1,
+
+  1, 1, 1, 1, 1, 1, 1, 1,  1, 1, 1, 1, 1, 1, 1, 1,
+  1, 1, 1, 1, 1, 1, 1, 1,  1, 1, 1, 1, 1, 1, 1, 1,
+  1, 1, 1, 1, 1, 1, 1, 1,  1, 1, 1, 1, 1, 1, 1, 1,
+  1, 1, 1, 1, 1, 1, 1, 1,  1, 1, 1, 1, 1, 1, 1, 1,
+  1, 1, 1, 1, 1, 1, 1, 1,  1, 1, 1, 1, 1, 1, 1, 1,
+  1, 1, 1, 1, 1, 1, 1, 1,  1, 1, 1, 1, 1, 1, 1, 1,
+  1, 1, 1, 1, 1, 1, 1, 1,  1, 1, 1, 1, 1, 1, 1, 1,
+  1, 1, 1, 1, 1, 1, 1, 1,  1, 1, 1, 1, 1, 1, 1, 1
+};
+
+
 #if !defined(SQLITE_DEBUG) && !defined(SQLITE_COVERAGE_TEST)
 #  define VVA(X)
 #else
@@ -357,11 +383,16 @@ static void jsonAppendString(JsonString *p, const char *zIn, u32 N){
   p->zBuf[p->nUsed++] = '"';
   for(i=0; i<N; i++){
     unsigned char c = ((unsigned const char*)zIn)[i];
-    if( c=='"' || c=='\\' ){
+    if( jsonIsOk[c] ){
+      p->zBuf[p->nUsed++] = c;
+    }else if( c=='"' || c=='\\' ){
       json_simple_escape:
       if( (p->nUsed+N+3-i > p->nAlloc) && jsonGrow(p,N+3-i)!=0 ) return;
       p->zBuf[p->nUsed++] = '\\';
-    }else if( c<=0x1f ){
+      p->zBuf[p->nUsed++] = c;
+    }else if( c=='\'' ){
+      p->zBuf[p->nUsed++] = c;
+    }else{
       static const char aSpecial[] = {
          0, 0, 0, 0, 0, 0, 0, 0, 'b', 't', 'n', 0, 'f', 'r', 0, 0,
          0, 0, 0, 0, 0, 0, 0, 0,   0,   0,   0, 0,   0,   0, 0, 0
@@ -372,6 +403,7 @@ static void jsonAppendString(JsonString *p, const char *zIn, u32 N){
       assert( aSpecial['\n']=='n' );
       assert( aSpecial['\r']=='r' );
       assert( aSpecial['\t']=='t' );
+      assert( c>=0 && c<sizeof(aSpecial) );
       if( aSpecial[c] ){
         c = aSpecial[c];
         goto json_simple_escape;
@@ -381,10 +413,9 @@ static void jsonAppendString(JsonString *p, const char *zIn, u32 N){
       p->zBuf[p->nUsed++] = 'u';
       p->zBuf[p->nUsed++] = '0';
       p->zBuf[p->nUsed++] = '0';
-      p->zBuf[p->nUsed++] = '0' + (c>>4);
-      c = "0123456789abcdef"[c&0xf];
+      p->zBuf[p->nUsed++] = "0123456789abcdef"[c>>4];
+      p->zBuf[p->nUsed++] = "0123456789abcdef"[c&0xf];
     }
-    p->zBuf[p->nUsed++] = c;
   }
   p->zBuf[p->nUsed++] = '"';
   assert( p->nUsed<p->nAlloc );
@@ -1070,7 +1101,9 @@ static int jsonParseAddNode(
   if( pParse->nNode>=pParse->nAlloc ){
     return jsonParseAddNodeExpand(pParse, eType, n, zContent);
   }
+  assert( pParse->aNode!=0 );
   p = &pParse->aNode[pParse->nNode];
+  assert( p!=0 );
   p->eType = (u8)(eType & 0xff);
   p->jnFlags = (u8)(eType >> 8);
   VVA( p->eU = zContent ? 1 : 0 );
@@ -1090,6 +1123,8 @@ static void jsonParseAddNodeArray(
   JsonNode *aNode,          /* Array of nodes to add */
   u32 nNode                 /* Number of elements in aNew */
 ){
+  assert( aNode!=0 );
+  assert( nNode>=1 );
   if( pParse->nNode + nNode > pParse->nAlloc ){
     u32 nNew = pParse->nNode + nNode;
     JsonNode *aNew = sqlite3_realloc64(pParse->aNode, nNew*sizeof(JsonNode));
@@ -1465,26 +1500,7 @@ json_parse_restart:
   parse_string:
     cDelim = z[i];
     for(j=i+1; 1; j++){
-      static const char aOk[256] = {
-          0, 0, 0, 0, 0, 0, 0, 0,  0, 0, 0, 0, 0, 0, 0, 0,
-          0, 0, 0, 0, 0, 0, 0, 0,  0, 0, 0, 0, 0, 0, 0, 0,
-          1, 1, 0, 1, 1, 1, 1, 0,  1, 1, 1, 1, 1, 1, 1, 1,
-          1, 1, 1, 1, 1, 1, 1, 1,  1, 1, 1, 1, 1, 1, 1, 1,
-          1, 1, 1, 1, 1, 1, 1, 1,  1, 1, 1, 1, 1, 1, 1, 1,
-          1, 1, 1, 1, 1, 1, 1, 1,  1, 1, 1, 1, 0, 1, 1, 1,
-          1, 1, 1, 1, 1, 1, 1, 1,  1, 1, 1, 1, 1, 1, 1, 1,
-          1, 1, 1, 1, 1, 1, 1, 1,  1, 1, 1, 1, 1, 1, 1, 1,
-
-          1, 1, 1, 1, 1, 1, 1, 1,  1, 1, 1, 1, 1, 1, 1, 1,
-          1, 1, 1, 1, 1, 1, 1, 1,  1, 1, 1, 1, 1, 1, 1, 1,
-          1, 1, 1, 1, 1, 1, 1, 1,  1, 1, 1, 1, 1, 1, 1, 1,
-          1, 1, 1, 1, 1, 1, 1, 1,  1, 1, 1, 1, 1, 1, 1, 1,
-          1, 1, 1, 1, 1, 1, 1, 1,  1, 1, 1, 1, 1, 1, 1, 1,
-          1, 1, 1, 1, 1, 1, 1, 1,  1, 1, 1, 1, 1, 1, 1, 1,
-          1, 1, 1, 1, 1, 1, 1, 1,  1, 1, 1, 1, 1, 1, 1, 1,
-          1, 1, 1, 1, 1, 1, 1, 1,  1, 1, 1, 1, 1, 1, 1, 1,
-      };
-      if( aOk[(unsigned char)z[j]] ) continue;
+      if( jsonIsOk[(unsigned char)z[j]] ) continue;
       c = z[j];
       if( c==cDelim ){
         break;
@@ -2006,20 +2022,25 @@ static JsonNode *jsonLookupStep(
   JsonNode *pRoot;
   if( pParse->oom ) return 0;
   pRoot = &pParse->aNode[iRoot];
-  while( (pRoot->jnFlags & JNODE_REPLACE)!=0 && pParse->useMod ){
-    u32 idx = (u32)(pRoot - pParse->aNode);
-    i = pParse->iSubst;
-    while( 1 /*exit-by-break*/ ){
-      assert( i<pParse->nNode );
-      assert( pParse->aNode[i].eType==JSON_SUBST );
-      assert( pParse->aNode[i].eU==4 );
-      assert( pParse->aNode[i].u.iPrev<i );
-      if( pParse->aNode[i].n==idx ){
-        pRoot = &pParse->aNode[i+1];
-        iRoot = i+1;
-        break;
+  if( pRoot->jnFlags & (JNODE_REPLACE|JNODE_REMOVE) && pParse->useMod ){
+    while( (pRoot->jnFlags & JNODE_REPLACE)!=0 ){
+      u32 idx = (u32)(pRoot - pParse->aNode);
+      i = pParse->iSubst;
+      while( 1 /*exit-by-break*/ ){
+        assert( i<pParse->nNode );
+        assert( pParse->aNode[i].eType==JSON_SUBST );
+        assert( pParse->aNode[i].eU==4 );
+        assert( pParse->aNode[i].u.iPrev<i );
+        if( pParse->aNode[i].n==idx ){
+          pRoot = &pParse->aNode[i+1];
+          iRoot = i+1;
+          break;
+        }
+        i = pParse->aNode[i].u.iPrev;
       }
-      i = pParse->aNode[i].u.iPrev;
+    }
+    if( pRoot->jnFlags & JNODE_REMOVE ){
+      return 0;
     }
   }
   if( zPath[0]==0 ) return pRoot;
@@ -2672,10 +2693,11 @@ static void jsonPatchFunc(
   UNUSED_PARAMETER(argc);
   pX = jsonParseCached(ctx, argv[0], ctx, 1);
   if( pX==0 ) return;
+  assert( pX->hasMod==0 );
+  pX->hasMod = 1;
   pY = jsonParseCached(ctx, argv[1], ctx, 1);
   if( pY==0 ) return;
   pX->useMod = 1;
-  pX->hasMod = 1;
   pY->useMod = 1;
   pResult = jsonMergePatch(pX, 0, pY->aNode);
   assert( pResult!=0 || pX->oom );
diff --git a/src/main.c b/src/main.c
index 8f21af13ee..cd02008909 100644
--- a/src/main.c
+++ b/src/main.c
@@ -1665,9 +1665,9 @@ static int sqliteDefaultBusyCallback(
   void *ptr,               /* Database connection */
   int count                /* Number of times table has been busy */
 ){
-#if SQLITE_OS_WIN || HAVE_USLEEP
+#if SQLITE_OS_WIN || !defined(HAVE_NANOSLEEP) || HAVE_NANOSLEEP
   /* This case is for systems that have support for sleeping for fractions of
-  ** a second.  Examples:  All windows systems, unix systems with usleep() */
+  ** a second.  Examples:  All windows systems, unix systems with nanosleep() */
   static const u8 delays[] =
      { 1, 2, 5, 10, 15, 20, 25, 25,  25,  50,  50, 100 };
   static const u8 totals[] =
@@ -4160,10 +4160,12 @@ int sqlite3_test_control(int op, ...){
         sqlite3ShowSrcList(0);
         sqlite3ShowWith(0);
         sqlite3ShowUpsert(0);
+#ifndef SQLITE_OMIT_TRIGGER
         sqlite3ShowTriggerStep(0);
         sqlite3ShowTriggerStepList(0);
         sqlite3ShowTrigger(0);
         sqlite3ShowTriggerList(0);
+#endif
 #ifndef SQLITE_OMIT_WINDOWFUNC
         sqlite3ShowWindow(0);
         sqlite3ShowWinFunc(0);
@@ -4470,6 +4472,7 @@ int sqlite3_test_control(int op, ...){
       break;
     }
 
+#if !defined(SQLITE_OMIT_WSD)
     /* sqlite3_test_control(SQLITE_TESTCTRL_USELONGDOUBLE, int X);
     **
     **   X<0     Make no changes to the bUseLongDouble.  Just report value.
@@ -4484,6 +4487,7 @@ int sqlite3_test_control(int op, ...){
       rc = sqlite3Config.bUseLongDouble!=0;
       break;
     }
+#endif
 
 
 #if defined(SQLITE_DEBUG) && !defined(SQLITE_OMIT_WSD)
diff --git a/src/os_unix.c b/src/os_unix.c
index aed4ac213f..59f67d142a 100644
--- a/src/os_unix.c
+++ b/src/os_unix.c
@@ -6715,12 +6715,17 @@ static int unixRandomness(sqlite3_vfs *NotUsed, int nBuf, char *zBuf){
 ** than the argument.
 */
 static int unixSleep(sqlite3_vfs *NotUsed, int microseconds){
-#if OS_VXWORKS || _POSIX_C_SOURCE >= 199309L
+#if !defined(HAVE_NANOSLEEP) || HAVE_NANOSLEEP+0
   struct timespec sp;
-
   sp.tv_sec = microseconds / 1000000;
   sp.tv_nsec = (microseconds % 1000000) * 1000;
+
+  /* Almost all modern unix systems support nanosleep().  But if you are
+  ** compiling for one of the rare exceptions, you can use
+  ** -DHAVE_NANOSLEEP=0 (perhaps in conjuction with -DHAVE_USLEEP if
+  ** usleep() is available) in order to bypass the use of nanosleep() */
   nanosleep(&sp, NULL);
+
   UNUSED_PARAMETER(NotUsed);
   return microseconds;
 #elif defined(HAVE_USLEEP) && HAVE_USLEEP
diff --git a/src/select.c b/src/select.c
index 098b745849..321badd07f 100644
--- a/src/select.c
+++ b/src/select.c
@@ -1298,6 +1298,16 @@ static void selectInnerLoop(
       testcase( eDest==SRT_Fifo );
       testcase( eDest==SRT_DistFifo );
       sqlite3VdbeAddOp3(v, OP_MakeRecord, regResult, nResultCol, r1+nPrefixReg);
+#if !defined(SQLITE_ENABLE_NULL_TRIM) && defined(SQLITE_DEBUG)
+      /* A destination of SRT_Table and a non-zero iSDParm2 parameter means
+      ** that this is an "UPDATE ... FROM" on a virtual table or view. In this
+      ** case set the p5 parameter of the OP_MakeRecord to OPFLAG_NOCHNG_MAGIC.
+      ** This does not affect operation in any way - it just allows MakeRecord
+      ** to process OPFLAG_NOCHANGE values without an assert() failing. */
+      if( eDest==SRT_Table && pDest->iSDParm2 ){
+        sqlite3VdbeChangeP5(v, OPFLAG_NOCHNG_MAGIC);
+      }
+#endif
 #ifndef SQLITE_OMIT_CTE
       if( eDest==SRT_DistFifo ){
         /* If the destination is DistFifo, then cursor (iParm+1) is open
@@ -4292,7 +4302,8 @@ static int compoundHasDifferentAffinities(Select *p){
 **        (27b) the subquery is a compound query and the RIGHT JOIN occurs
 **              in any arm of the compound query.  (See also (17g).)
 **
-**  (28)  The subquery is not a MATERIALIZED CTE.
+**  (28)  The subquery is not a MATERIALIZED CTE.  (This is handled
+**        in the caller before ever reaching this routine.)
 **
 **
 ** In this routine, the "p" parameter is a pointer to the outer query.
@@ -4402,9 +4413,9 @@ static int flattenSubquery(
   if( iFrom>0 && (pSubSrc->a[0].fg.jointype & JT_LTORJ)!=0 ){
     return 0;   /* Restriction (27a) */
   }
-  if( pSubitem->fg.isCte && pSubitem->u2.pCteUse->eM10d==M10d_Yes ){
-    return 0;       /* (28) */
-  }
+
+  /* Condition (28) is blocked by the caller */
+  assert( !pSubitem->fg.isCte || pSubitem->u2.pCteUse->eM10d!=M10d_Yes );
 
   /* Restriction (17): If the sub-query is a compound SELECT, then it must
   ** use only the UNION ALL operator. And none of the simple select queries
@@ -7285,6 +7296,14 @@ int sqlite3Select(
       goto select_end;
     }
 
+    /* Do not attempt the usual optimizations (flattening and ORDER BY
+    ** elimination) on a MATERIALIZED common table expression because
+    ** a MATERIALIZED common table expression is an optimization fence.
+    */
+    if( pItem->fg.isCte && pItem->u2.pCteUse->eM10d==M10d_Yes ){
+      continue;
+    }
+
     /* Do not try to flatten an aggregate subquery.
     **
     ** Flattening an aggregate subquery is only possible if the outer query
@@ -7314,6 +7333,8 @@ int sqlite3Select(
     **            (a)  The outer query has a different ORDER BY clause
     **            (b)  The subquery is part of a join
     **          See forum post 062d576715d277c8
+    **
+    ** Also retain the ORDER BY if the OmitOrderBy optimization is disabled.
     */
     if( pSub->pOrderBy!=0
      && (p->pOrderBy!=0 || pTabList->nSrc>1)      /* Condition (5) */
diff --git a/src/sqlite.h.in b/src/sqlite.h.in
index aa2cd73436..48009b1454 100644
--- a/src/sqlite.h.in
+++ b/src/sqlite.h.in
@@ -4427,10 +4427,10 @@ int sqlite3_stmt_isexplain(sqlite3_stmt *pStmt);
 ** METHOD: sqlite3_stmt
 **
 ** The sqlite3_stmt_explain(S,E) interface changes the EXPLAIN
-** setting for prepared statement S.  If E is zero, then S becomes
+** setting for [prepared statement] S.  If E is zero, then S becomes
 ** a normal prepared statement.  If E is 1, then S behaves as if
-** its SQL text began with "EXPLAIN".  If E is 2, then S behaves as if
-** its SQL text began with "EXPLAIN QUERY PLAN".
+** its SQL text began with "[EXPLAIN]".  If E is 2, then S behaves as if
+** its SQL text began with "[EXPLAIN QUERY PLAN]".
 **
 ** Calling sqlite3_stmt_explain(S,E) might cause S to be reprepared.
 ** SQLite tries to avoid a reprepare, but a reprepare might be necessary
@@ -4438,8 +4438,8 @@ int sqlite3_stmt_isexplain(sqlite3_stmt *pStmt);
 **
 ** Because of the potential need to reprepare, a call to
 ** sqlite3_stmt_explain(S,E) will fail with SQLITE_ERROR if S cannot be
-** reprepared because it was created using sqlite3_prepare() instead of
-** the newer sqlite_prepare_v2() or sqlite3_prepare_v3() interfaces and
+** reprepared because it was created using [sqlite3_prepare()] instead of
+** the newer [sqlite3_prepare_v2()] or [sqlite3_prepare_v3()] interfaces and
 ** hence has no saved SQL text with which to reprepare.
 **
 ** Changing the explain setting for a prepared statement does not change
diff --git a/src/sqliteInt.h b/src/sqliteInt.h
index 78ae7ad69e..c2a9f855a7 100644
--- a/src/sqliteInt.h
+++ b/src/sqliteInt.h
@@ -894,7 +894,7 @@ typedef INT16_TYPE LogEst;
 /*
 ** P is one byte past the end of a large buffer. Return true if a span of bytes
 ** between S..E crosses the end of that buffer.  In other words, return true
-** if the sub-buffer S..E-1 overflows the buffer show last byte is P-1.
+** if the sub-buffer S..E-1 overflows the buffer whose last byte is P-1.
 **
 ** S is the start of the span.  E is one byte past the end of end of span.
 **
@@ -1257,7 +1257,6 @@ typedef struct Cte Cte;
 typedef struct CteUse CteUse;
 typedef struct Db Db;
 typedef struct DbFixer DbFixer;
-typedef struct DblDbl DblDbl;
 typedef struct Schema Schema;
 typedef struct Expr Expr;
 typedef struct ExprList ExprList;
@@ -1874,6 +1873,7 @@ struct sqlite3 {
 #define SQLITE_IndexedExpr    0x01000000 /* Pull exprs from index when able */
 #define SQLITE_Coroutines     0x02000000 /* Co-routines for subqueries */
 #define SQLITE_NullUnusedCols 0x04000000 /* NULL unused columns in subqueries */
+#define SQLITE_OnePass        0x08000000 /* Single-pass DELETE and UPDATE */
 #define SQLITE_AllOpts        0xffffffff /* All optimizations */
 
 /*
@@ -3777,6 +3777,9 @@ struct Parse {
   int regRoot;         /* Register holding root page number for new objects */
   int nMaxArg;         /* Max args passed to user function by sub-program */
   int nSelect;         /* Number of SELECT stmts. Counter for Select.selId */
+#ifndef SQLITE_OMIT_PROGRESS_CALLBACK
+  u32 nProgressSteps;  /* xProgress steps taken during sqlite3_prepare() */
+#endif
 #ifndef SQLITE_OMIT_SHARED_CACHE
   int nTableLock;        /* Number of locks in aTableLock */
   TableLock *aTableLock; /* Required table locks for shared-cache mode */
@@ -3790,12 +3793,9 @@ struct Parse {
     int addrCrTab;         /* Address of OP_CreateBtree on CREATE TABLE */
     Returning *pReturning; /* The RETURNING clause */
   } u1;
-  u32 nQueryLoop;      /* Est number of iterations of a query (10*log2(N)) */
   u32 oldmask;         /* Mask of old.* columns referenced */
   u32 newmask;         /* Mask of new.* columns referenced */
-#ifndef SQLITE_OMIT_PROGRESS_CALLBACK
-  u32 nProgressSteps;  /* xProgress steps taken during sqlite3_prepare() */
-#endif
+  LogEst nQueryLoop;   /* Est number of iterations of a query (10*log2(N)) */
   u8 eTriggerOp;       /* TK_UPDATE, TK_INSERT or TK_DELETE */
   u8 bReturning;       /* Coding a RETURNING trigger */
   u8 eOrconf;          /* Default ON CONFLICT policy for trigger steps */
diff --git a/src/test1.c b/src/test1.c
index 520508d1ca..4dcf7bc11f 100644
--- a/src/test1.c
+++ b/src/test1.c
@@ -8009,6 +8009,7 @@ static int SQLITE_TCLAPI optimization_control(
     { "push-down",           SQLITE_PushDown       },
     { "balanced-merge",      SQLITE_BalancedMerge  },
     { "propagate-const",     SQLITE_PropagateConst },
+    { "one-pass",            SQLITE_OnePass        },
   };
 
   if( objc!=4 ){
diff --git a/src/update.c b/src/update.c
index a792862247..3b3c2f838b 100644
--- a/src/update.c
+++ b/src/update.c
@@ -741,7 +741,7 @@ void sqlite3Update(
        && !hasFK
        && !chngKey
        && !bReplace
-       && (sNC.ncFlags & NC_Subquery)==0
+       && (pWhere==0 || !ExprHasProperty(pWhere, EP_Subquery))
       ){
         flags |= WHERE_ONEPASS_MULTIROW;
       }
@@ -1259,7 +1259,9 @@ static void updateVirtualTable(
           sqlite3ExprDup(db, pChanges->a[aXRef[i]].pExpr, 0)
         );
       }else{
-        pList = sqlite3ExprListAppend(pParse, pList, exprRowColumn(pParse, i));
+        Expr *pRow = exprRowColumn(pParse, i);
+        if( pRow ) pRow->op2 = OPFLAG_NOCHNG;
+        pList = sqlite3ExprListAppend(pParse, pList, pRow);
       }
     }
 
diff --git a/src/util.c b/src/util.c
index edb02f9b7c..e417034754 100644
--- a/src/util.c
+++ b/src/util.c
@@ -608,7 +608,12 @@ do_atof_calc:
       while( e<=-10  ){ e+=10;  r *= 1.0e-10L;  }
       while( e<=-1   ){ e+=1;   r *= 1.0e-01L;  }
     }
-    *pResult = r;
+    assert( r>=0.0 );
+    if( r>+1.7976931348623157081452742373e+308L ){
+      *pResult = +INFINITY;
+    }else{
+      *pResult = (double)r;
+    }
   }else{
     double rr[2];
     u64 s2;
diff --git a/src/vdbe.c b/src/vdbe.c
index b8ee05e415..5899fa518e 100644
--- a/src/vdbe.c
+++ b/src/vdbe.c
@@ -708,6 +708,8 @@ static SQLITE_NOINLINE int vdbeColumnFromOverflow(
   int iCol,             /* The column to read */
   int t,                /* The serial-type code for the column value */
   i64 iOffset,          /* Offset to the start of the content value */
+  u32 cacheStatus,      /* Current Vdbe.cacheCtr value */
+  u32 colCacheCtr,      /* Current value of the column cache counter */
   Mem *pDest            /* Store the value into this register. */
 ){
   int rc;
@@ -716,12 +718,16 @@ static SQLITE_NOINLINE int vdbeColumnFromOverflow(
   int len = sqlite3VdbeSerialTypeLen(t);
   assert( pC->eCurType==CURTYPE_BTREE );
   if( len>db->aLimit[SQLITE_LIMIT_LENGTH] ) return SQLITE_TOOBIG;
-  if( len > 4000 ){
+  if( len > 4000 && pC->pKeyInfo==0 ){
     /* Cache large column values that are on overflow pages using
     ** an RCStr (reference counted string) so that if they are reloaded,
     ** that do not have to be copied a second time.  The overhead of
     ** creating and managing the cache is such that this is only
     ** profitable for larger TEXT and BLOB values.
+    **
+    ** Only do this on table-btrees so that writes to index-btrees do not
+    ** need to clear the cache.  This buys performance in the common case
+    ** in exchange for generality.
     */
     VdbeTxtBlbCache *pCache;
     char *pBuf;
@@ -733,6 +739,8 @@ static SQLITE_NOINLINE int vdbeColumnFromOverflow(
     pCache = pC->pCache;
     if( pCache->pCValue==0
      || pCache->iCol!=iCol
+     || pCache->cacheStatus!=cacheStatus
+     || pCache->colCacheCtr!=colCacheCtr
      || pCache->iOffset!=sqlite3BtreeOffset(pC->uc.pCursor)
     ){
       if( pCache->pCValue ) sqlite3RCStrUnref(pCache->pCValue);
@@ -744,6 +752,8 @@ static SQLITE_NOINLINE int vdbeColumnFromOverflow(
       pBuf[len+1] = 0;
       pBuf[len+2] = 0;
       pCache->iCol = iCol;
+      pCache->cacheStatus = cacheStatus;
+      pCache->colCacheCtr = colCacheCtr;
       pCache->iOffset = sqlite3BtreeOffset(pC->uc.pCursor);
     }else{
       pBuf = pCache->pCValue;
@@ -814,6 +824,7 @@ int sqlite3VdbeExec(
   Mem *pIn2 = 0;             /* 2nd input operand */
   Mem *pIn3 = 0;             /* 3rd input operand */
   Mem *pOut = 0;             /* Output operand */
+  u32 colCacheCtr = 0;       /* Column cache counter */
 #if defined(SQLITE_ENABLE_STMT_SCANSTATUS) || defined(VDBE_PROFILE)
   u64 *pnCycle = 0;
   int bStmtScanStatus = IS_STMT_SCANSTATUS(db)!=0;
@@ -2349,10 +2360,10 @@ case OP_Ge: {             /* same as TK_GE, jump, in1, in3 */
 ** opcodes are allowed to occur between this instruction and the previous
 ** OP_Lt or OP_Gt.
 **
-** If result of an OP_Eq comparison on the same two operands as the
-** prior OP_Lt or OP_Gt would have been true, then jump to P2.
-** If the result of an OP_Eq comparison on the two previous
-** operands would have been false or NULL, then fall through.
+** If the result of an OP_Eq comparison on the same two operands as
+** the prior OP_Lt or OP_Gt would have been true, then jump to P2.  If
+** the result of an OP_Eq comparison on the two previous operands
+** would have been false or NULL, then fall through.
 */
 case OP_ElseEq: {       /* same as TK_ESCAPE, jump */
 
@@ -2782,7 +2793,7 @@ case OP_IsType: {        /* jump */
 /* Opcode: ZeroOrNull P1 P2 P3 * *
 ** Synopsis: r[P2] = 0 OR NULL
 **
-** If all both registers P1 and P3 are NOT NULL, then store a zero in
+** If both registers P1 and P3 are NOT NULL, then store a zero in
 ** register P2.  If either registers P1 or P3 are NULL then put
 ** a NULL in register P2.
 */
@@ -3145,7 +3156,7 @@ op_column_restart:
               || (t>=12 && ((t&1)==0 || p5==OPFLAG_BYTELENARG))
              )
         )
-     || (len = sqlite3VdbeSerialTypeLen(t))==0
+     || sqlite3VdbeSerialTypeLen(t)==0
     ){
       /* Content is irrelevant for
       **    1. the typeof() function,
@@ -3162,7 +3173,8 @@ op_column_restart:
       */
       sqlite3VdbeSerialGet((u8*)sqlite3CtypeMap, t, pDest);
     }else{
-      rc = vdbeColumnFromOverflow(pC, p2, t, aOffset[p2], pDest);
+      rc = vdbeColumnFromOverflow(pC, p2, t, aOffset[p2],
+                p->cacheCtr, colCacheCtr, pDest);
       if( rc ){
         if( rc==SQLITE_NOMEM ) goto no_mem;
         if( rc==SQLITE_TOOBIG ) goto too_big;
@@ -5182,13 +5194,13 @@ case OP_IfNotOpen: {        /* jump */
 ** operands to OP_NotFound and OP_IdxGT.
 **
 ** This opcode is an optimization attempt only.  If this opcode always
-** falls through, the correct answer is still obtained, but extra works
+** falls through, the correct answer is still obtained, but extra work
 ** is performed.
 **
 ** A value of N in the seekHit flag of cursor P1 means that there exists
 ** a key P3:N that will match some record in the index.  We want to know
 ** if it is possible for a record P3:P4 to match some record in the
-** index.  If it is not possible, we can skips some work.  So if seekHit
+** index.  If it is not possible, we can skip some work.  So if seekHit
 ** is less than P4, attempt to find out if a match is possible by running
 ** OP_NotFound.
 **
@@ -5700,6 +5712,7 @@ case OP_Insert: {
   );
   pC->deferredMoveto = 0;
   pC->cacheStatus = CACHE_STALE;
+  colCacheCtr++;
 
   /* Invoke the update-hook if required. */
   if( rc ) goto abort_due_to_error;
@@ -5753,10 +5766,10 @@ case OP_RowCell: {
 ** left in an undefined state.
 **
 ** If the OPFLAG_AUXDELETE bit is set on P5, that indicates that this
-** delete one of several associated with deleting a table row and all its
-** associated index entries.  Exactly one of those deletes is the "primary"
-** delete.  The others are all on OPFLAG_FORDELETE cursors or else are
-** marked with the AUXDELETE flag.
+** delete is one of several associated with deleting a table row and
+** all its associated index entries.  Exactly one of those deletes is
+** the "primary" delete.  The others are all on OPFLAG_FORDELETE
+** cursors or else are marked with the AUXDELETE flag.
 **
 ** If the OPFLAG_NCHANGE flag of P2 (NB: P2 not P5) is set, then the row
 ** change count is incremented (otherwise not).
@@ -5860,6 +5873,7 @@ case OP_Delete: {
 
   rc = sqlite3BtreeDelete(pC->uc.pCursor, pOp->p5);
   pC->cacheStatus = CACHE_STALE;
+  colCacheCtr++;
   pC->seekResult = 0;
   if( rc ) goto abort_due_to_error;
 
@@ -5927,7 +5941,7 @@ case OP_SorterCompare: {
 ** Write into register P2 the current sorter data for sorter cursor P1.
 ** Then clear the column header cache on cursor P3.
 **
-** This opcode is normally use to move a record out of the sorter and into
+** This opcode is normally used to move a record out of the sorter and into
 ** a register that is the source for a pseudo-table cursor created using
 ** OpenPseudo.  That pseudo-table cursor is the one that is identified by
 ** parameter P3.  Clearing the P3 column cache as part of this opcode saves
@@ -6736,7 +6750,7 @@ case OP_IdxGE:  {       /* jump, ncycle */
 ** file is given by P1.
 **
 ** The table being destroyed is in the main database file if P3==0.  If
-** P3==1 then the table to be clear is in the auxiliary database file
+** P3==1 then the table to be destroyed is in the auxiliary database file
 ** that is used to store tables create using CREATE TEMPORARY TABLE.
 **
 ** If AUTOVACUUM is enabled then it is possible that another root page
@@ -6796,8 +6810,8 @@ case OP_Destroy: {     /* out2 */
 ** in the database file is given by P1.  But, unlike Destroy, do not
 ** remove the table or index from the database file.
 **
-** The table being clear is in the main database file if P2==0.  If
-** P2==1 then the table to be clear is in the auxiliary database file
+** The table being cleared is in the main database file if P2==0.  If
+** P2==1 then the table to be cleared is in the auxiliary database file
 ** that is used to store tables create using CREATE TEMPORARY TABLE.
 **
 ** If the P3 value is non-zero, then the row change count is incremented
diff --git a/src/vdbeInt.h b/src/vdbeInt.h
index f424559929..2a23c3f285 100644
--- a/src/vdbeInt.h
+++ b/src/vdbeInt.h
@@ -159,6 +159,8 @@ struct VdbeTxtBlbCache {
   char *pCValue;        /* A RCStr buffer to hold the value */
   i64 iOffset;          /* File offset of the row being cached */
   int iCol;             /* Column for which the cache is valid */
+  u32 cacheStatus;      /* Vdbe.cacheCtr value */
+  u32 colCacheCtr;      /* Column cache counter */
 };
 
 /*
diff --git a/src/vdbeapi.c b/src/vdbeapi.c
index cb631413c4..cc58e7a877 100644
--- a/src/vdbeapi.c
+++ b/src/vdbeapi.c
@@ -1863,19 +1863,23 @@ int sqlite3_stmt_isexplain(sqlite3_stmt *pStmt){
 int sqlite3_stmt_explain(sqlite3_stmt *pStmt, int eMode){
   Vdbe *v = (Vdbe*)pStmt;
   int rc;
-  if( v->eVdbeState!=VDBE_READY_STATE ) return SQLITE_BUSY; 
-  if( v->explain==eMode ) return SQLITE_OK;
-  if( v->zSql==0 || eMode<0 || eMode>2 ) return SQLITE_ERROR;
   sqlite3_mutex_enter(v->db->mutex);
-  if( v->nMem>=10 && (eMode!=2 || v->haveEqpOps) ){
+  if( v->explain==eMode ){
+    rc = SQLITE_OK;
+  }else if( eMode<0 || eMode>2 ){
+    rc = SQLITE_ERROR;
+  }else if( (v->prepFlags & SQLITE_PREPARE_SAVESQL)==0 ){
+    rc = SQLITE_ERROR;
+  }else if( v->eVdbeState!=VDBE_READY_STATE ){
+    rc = SQLITE_BUSY;
+  }else if( v->nMem>=10 && (eMode!=2 || v->haveEqpOps) ){
     /* No reprepare necessary */
     v->explain = eMode;
     rc = SQLITE_OK;
   }else{
-    int haveEqpOps = v->explain==2 || v->haveEqpOps;
     v->explain = eMode;
     rc = sqlite3Reprepare(v);
-    v->haveEqpOps = haveEqpOps!=0;
+    v->haveEqpOps = eMode==2;
   }
   if( v->explain ){
     v->nResColumn = 12 - 4*v->explain;
diff --git a/src/vdbemem.c b/src/vdbemem.c
index 07fb8feee8..e25efc9771 100644
--- a/src/vdbemem.c
+++ b/src/vdbemem.c
@@ -322,7 +322,10 @@ int sqlite3VdbeMemClearAndResize(Mem *pMem, int szNew){
 ** this routine is a no-op.
 */
 void sqlite3VdbeMemZeroTerminateIfAble(Mem *pMem){
-  if( (pMem->flags & (MEM_Str|MEM_Term))!=MEM_Str ) return;
+  if( (pMem->flags & (MEM_Str|MEM_Term|MEM_Ephem|MEM_Static))!=MEM_Str ){
+    /* pMem must be a string, and it cannot be an ephemeral or static string */
+    return;
+  }
   if( pMem->enc!=SQLITE_UTF8 ) return;
   if( NEVER(pMem->z==0) ) return;
   if( pMem->flags & MEM_Dyn ){
@@ -338,7 +341,7 @@ void sqlite3VdbeMemZeroTerminateIfAble(Mem *pMem){
       pMem->flags |= MEM_Term;
       return;
     }
-  }else if( pMem->szMalloc>0 && pMem->szMalloc >= pMem->n+1 ){
+  }else if( pMem->szMalloc >= pMem->n+1 ){
     pMem->z[pMem->n] = 0;
     pMem->flags |= MEM_Term;
     return;
diff --git a/src/where.c b/src/where.c
index 35b9056ffe..213df42230 100644
--- a/src/where.c
+++ b/src/where.c
@@ -2535,7 +2535,7 @@ static WhereLoop **whereLoopFindLesser(
 
     /* If pTemplate is always better than p, then cause p to be overwritten
     ** with pTemplate.  pTemplate is better than p if:
-    **   (1)  pTemplate has no more dependences than p, and
+    **   (1)  pTemplate has no more dependencies than p, and
     **   (2)  pTemplate has an equal or lower cost than p.
     */
     if( (p->prereq & pTemplate->prereq)==pTemplate->prereq   /* (1)  */
@@ -5003,7 +5003,8 @@ static int wherePathSolver(WhereInfo *pWInfo, LogEst nRowEst){
   ** For joins of 3 or more tables, track the 10 best paths */
   mxChoice = (nLoop<=1) ? 1 : (nLoop==2 ? 5 : 10);
   assert( nLoop<=pWInfo->pTabList->nSrc );
-  WHERETRACE(0x002, ("---- begin solver.  (nRowEst=%d)\n", nRowEst));
+  WHERETRACE(0x002, ("---- begin solver.  (nRowEst=%d, nQueryLoop=%d)\n",
+                     nRowEst, pParse->nQueryLoop));
 
   /* If nRowEst is zero and there is an ORDER BY clause, ignore it. In this
   ** case the purpose of this call is to estimate the number of rows returned
@@ -5757,6 +5758,28 @@ static SQLITE_NOINLINE void whereAddIndexedExpr(
   }
 }
 
+/*
+** Set the reverse-scan order mask to one for all tables in the query
+** with the exception of MATERIALIZED common table expressions that have
+** their own internal ORDER BY clauses.
+**
+** This implements the PRAGMA reverse_unordered_selects=ON setting.
+** (Also SQLITE_DBCONFIG_REVERSE_SCANORDER).
+*/
+static SQLITE_NOINLINE void whereReverseScanOrder(WhereInfo *pWInfo){
+  int ii;
+  for(ii=0; ii<pWInfo->pTabList->nSrc; ii++){
+    SrcItem *pItem = &pWInfo->pTabList->a[ii];
+    if( !pItem->fg.isCte
+     || pItem->u2.pCteUse->eM10d!=M10d_Yes
+     || NEVER(pItem->pSelect==0)
+     || pItem->pSelect->pOrderBy==0
+    ){
+      pWInfo->revMask |= MASKBIT(ii);
+    }
+  }
+}
+
 /*
 ** Generate the beginning of the loop used for WHERE clause processing.
 ** The return value is a pointer to an opaque structure that contains
@@ -6121,8 +6144,9 @@ WhereInfo *sqlite3WhereBegin(
        if( db->mallocFailed ) goto whereBeginError;
     }
   }
+  assert( pWInfo->pTabList!=0 );
   if( pWInfo->pOrderBy==0 && (db->flags & SQLITE_ReverseOrder)!=0 ){
-     pWInfo->revMask = ALLBITS;
+    whereReverseScanOrder(pWInfo);
   }
   if( pParse->nErr ){
     goto whereBeginError;
@@ -6222,6 +6246,7 @@ WhereInfo *sqlite3WhereBegin(
         0!=(wctrlFlags & WHERE_ONEPASS_MULTIROW)
      && !IsVirtual(pTabList->a[0].pTab)
      && (0==(wsFlags & WHERE_MULTI_OR) || (wctrlFlags & WHERE_DUPLICATES_OK))
+     && OptimizationEnabled(db, SQLITE_OnePass)
     )){
       pWInfo->eOnePass = bOnerow ? ONEPASS_SINGLE : ONEPASS_MULTI;
       if( HasRowid(pTabList->a[0].pTab) && (wsFlags & WHERE_IDX_ONLY) ){
diff --git a/test/corruptL.test b/test/corruptL.test
index 65d9821b35..cf38764415 100644
--- a/test/corruptL.test
+++ b/test/corruptL.test
@@ -1269,6 +1269,7 @@ do_test 15.0 {
 }]} {}
 
 extra_schema_checks 0
+optimization_control db one-pass off
 do_catchsql_test 15.1 {
   PRAGMA cell_size_check = 0;
   UPDATE c1 SET c= NOT EXISTS(SELECT 1 FROM c1 ORDER BY (SELECT 1 FROM c1 ORDER BY a)) +10 WHERE d BETWEEN 4 AND 7;
diff --git a/test/fuzzdata8.db b/test/fuzzdata8.db
index a4969047aa..6b434f6bbf 100644
Binary files a/test/fuzzdata8.db and b/test/fuzzdata8.db differ
diff --git a/test/json102.test b/test/json102.test
index bfd5e7ed07..276c1816a7 100644
--- a/test/json102.test
+++ b/test/json102.test
@@ -397,4 +397,22 @@ do_execsql_test json102-1610 {
   6 {}        null {}        null    {}        null
 ]
 
+reset_db
+do_execsql_test json102-1700 {
+  CREATE TABLE t1(a1 DATE, a2 INTEGER PRIMARY KEY, a3 INTEGER, memo TEXT);
+  CREATE INDEX t1x1 ON t1(a3, a1, memo->>'y');
+  INSERT INTO t1(a2,a1,a3,memo) VALUES (876, '2023-08-03', 5, '{"x":77,"y":4}');
+}
+do_execsql_test json102-1710 {
+  UPDATE t1 SET memo = JSON_REMOVE(memo, '$.y');
+  PRAGMA integrity_check;
+  SELECT * FROM t1;
+} {ok 2023-08-03 876 5 {{"x":77}}}
+do_execsql_test json102-1720 {
+  UPDATE t1 SET memo = JSON_SET(memo, '$.y', 6)
+    WHERE a2 IN (876) AND JSON_TYPE(memo, '$.y') IS NULL;
+  PRAGMA integrity_check;
+  SELECT * FROM t1;
+} {ok 2023-08-03 876 5 {{"x":77,"y":6}}}
+
 finish_test
diff --git a/test/update.test b/test/update.test
index 47b6029bee..bf7666662a 100644
--- a/test/update.test
+++ b/test/update.test
@@ -764,5 +764,27 @@ do_execsql_test update-21.4 {
   SELECT * FROM t1 ORDER BY vkey, c5;
   ROLLBACK;
 } {6 -54 100 NULL}
+# Follow-up on 2023-07-31 (forum post https://sqlite.org/forum/forumpost/8ab195fd44e75ed0):
+# Only disable one-pass if the subquery is in the WHERE clause.  The SET expressions
+# do not count.
+do_execsql_test update-21.11 {
+  DROP TABLE t1;
+  CREATE TABLE t1(a INTEGER PRIMARY KEY, b INT);
+  CREATE TABLE t2(d INT);
+}
+do_eqp_test update-21.12 {
+  WITH t3(x,y) AS (SELECT d, row_number()OVER() FROM t2)
+    UPDATE t1 SET b=(SELECT y FROM t3 WHERE t1.a=t3.x);
+} {
+  QUERY PLAN
+  |--SCAN t1
+  `--CORRELATED SCALAR SUBQUERY xxxxxx
+     |--CO-ROUTINE t3
+     |  |--CO-ROUTINE (subquery-xxxxxx)
+     |  |  `--SCAN t2
+     |  `--SCAN (subquery-xxxxxx)
+     |--BLOOM FILTER ON t3 (x=?)
+     `--SEARCH t3 USING AUTOMATIC COVERING INDEX (x=?)
+}
 
 finish_test
diff --git a/test/where7.test b/test/where7.test
index f76e8aba8b..681684b809 100644
--- a/test/where7.test
+++ b/test/where7.test
@@ -47,18 +47,33 @@ do_test where7-1.1 {
     SELECT * FROM t1;
   }
 } {1 2 3 4 2 3 4 5 3 4 6 8 4 5 10 15 5 10 100 1000}
-do_execsql_test where7-1.1.1 {
-  CREATE TABLE t(a);
-  CREATE INDEX ta ON t(a);
-  INSERT INTO t(a) VALUES(1),(2);
-  SELECT * FROM t ORDER BY a;
-  SELECT * FROM t WHERE a<2 OR a<3 ORDER BY a;
-  PRAGMA count_changes=ON;
-  DELETE FROM t WHERE a<2 OR a<3;
-  SELECT * FROM t;
-  PRAGMA count_changes=OFF;
-  DROP TABLE t;
-} {1 2 1 2 2}
+if {[permutation] != "no_optimization"} {
+  do_execsql_test where7-1.1.1 {
+    CREATE TABLE t(a);
+    CREATE INDEX ta ON t(a);
+    INSERT INTO t(a) VALUES(1),(2);
+    SELECT * FROM t ORDER BY a;
+    SELECT * FROM t WHERE a<2 OR a<3 ORDER BY a;
+    PRAGMA count_changes=ON;
+    DELETE FROM t WHERE a<2 OR a<3;
+    SELECT * FROM t;
+    PRAGMA count_changes=OFF;
+    DROP TABLE t;
+  } {1 2 1 2 2}
+} else {
+  do_execsql_test where7-1.1.1-noopt {
+    CREATE TABLE t(a);
+    CREATE INDEX ta ON t(a);
+    INSERT INTO t(a) VALUES(1),(2);
+    SELECT * FROM t ORDER BY a;
+    SELECT * FROM t WHERE a<2 OR a<3 ORDER BY a;
+    PRAGMA count_changes=ON;
+    DELETE FROM t WHERE a<2 OR a<3;
+    SELECT * FROM t;
+    PRAGMA count_changes=OFF;
+    DROP TABLE t;
+  } {1 2 1 2 3}
+}
 do_test where7-1.2 {
   count_steps {
     SELECT a FROM t1 WHERE b=3 OR c=6 ORDER BY a
diff --git a/tool/build-shell.sh b/tool/build-shell.sh
index 6a48299d73..a57f753039 100644
--- a/tool/build-shell.sh
+++ b/tool/build-shell.sh
@@ -16,7 +16,6 @@ gcc -o sqlite3 -g -Os -I. \
    -DSQLITE_ENABLE_FTS4 \
    -DSQLITE_ENABLE_RTREE \
    -DHAVE_READLINE \
-   -DHAVE_USLEEP=1 \
    ../sqlite/src/shell.c \
    ../sqlite/src/test_vfstrace.c \
    sqlite3.c -ldl -lreadline -lncurses
diff --git a/tool/mksqlite3c.tcl b/tool/mksqlite3c.tcl
index 2b8f08deb5..6def8fa447 100644
--- a/tool/mksqlite3c.tcl
+++ b/tool/mksqlite3c.tcl
@@ -87,7 +87,7 @@ set out [open $fname w]
 # Force the output to use unix line endings, even on Windows.
 fconfigure $out -translation lf
 set today [clock format [clock seconds] -format "%Y-%m-%d %H:%M:%S UTC" -gmt 1]
-puts $out \
+puts $out [subst \
 {/******************************************************************************
 ** This file is an amalgamation of many separate C source files from SQLite
 ** version $VERSION.  By combining all the individual C code files into this
@@ -106,7 +106,7 @@ puts $out \
 ** if you want a wrapper to interface SQLite with your choice of programming
 ** language. The code for the "sqlite3" command-line shell is also in a
 ** separate file. This file contains only code for the core SQLite library.
-**}
+**}]
 set srcroot [file dirname [file dirname [info script]]]
 if {$tcl_platform(platform)=="windows"} {
   set vsrcprog src-verify.exe
diff --git a/tool/warnings.sh b/tool/warnings.sh
index 60d2b42100..2b962d15ed 100644
--- a/tool/warnings.sh
+++ b/tool/warnings.sh
@@ -32,7 +32,6 @@ if test x`uname` = 'xLinux'; then
 echo '********** Android configuration ******************************'
 echo '**********    ' Options: $WARNING_ANDROID_OPTS
 gcc -c \
-  -DHAVE_USLEEP=1 \
   -DSQLITE_HAVE_ISNAN \
   -DSQLITE_DEFAULT_JOURNAL_SIZE_LIMIT=1048576 \
   -DSQLITE_THREADSAFE=2 \