chore: mark private variables as such and remove obsolete ones

lib/multi.js

@@ -22,7 +22,7 @@ function pipelineTransactionCommand (multi, command, index) {
     if (err) {
       tmp(err)
       err.position = index
-      multi.errors.push(err)
+      multi._errors.push(err)
       return
     }
     tmp(null, reply)
@@ -73,7 +73,7 @@ function multiCallback (multi, replies) {
 function execTransaction (multi) {
   const client = multi._client
   const queue = multi._queue
-  if (multi.monitoring || client.monitoring) {
+  if (multi._monitoring || client._monitoring) {
     const err = new RangeError(
       'Using transaction with a client that is in monitor mode does not work due to faulty return values of Redis.'
     )
@@ -87,9 +87,8 @@ function execTransaction (multi) {
     })
   }
   const len = queue.length
-  multi.errors = []
+  multi._errors = []
   client._multi = true
-  multi.wantsBuffers = new Array(len)
   // Silently ignore this error. We'll receive the error for the exec as well
   const promises = [client.internalSendCommand(new Command('multi', [])).catch(() => {})]
   // Drain queue, callback will catch 'QUEUED' or error
@@ -100,7 +99,7 @@ function execTransaction (multi) {
 
   const main = client.internalSendCommand(new Command('exec', []))
   return Promise.all(promises).then(() => main.then((replies) => multiCallback(multi, replies)).catch((err) => {
-    err.errors = multi.errors
+    err.errors = multi._errors
     return Promise.reject(err)
   }))
 }