🚑 added special case to fuzzers to fix #504

Since #329, NaN and inf numbers do not yield an exception, but are
stored internally and are dumped as “null”. This commit adjusts the
fuzz testers to deal with this special case.

test/src/fuzzer-parse_cbor.cpp

@@ -41,8 +41,8 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size)
             // parse serialization
             json j2 = json::from_cbor(vec2);
 
-            // deserializations must match
-            assert(j1 == j2);
+            // serializations must match
+            assert(json::to_cbor(j2) == vec2);
         }
         catch (const json::parse_error&)
         {