refactor(serialization): revert optimization

Author: mbroadst

lib/bson/bson.js

@@ -53,7 +53,7 @@ BSON.prototype.serialize = function serialize(object, options) {
     typeof options.ignoreUndefined === 'boolean' ? options.ignoreUndefined : true;
   var minInternalBufferSize =
     typeof options.minInternalBufferSize === 'number' ? options.minInternalBufferSize : MAXSIZE;
-  
+
   // Resize the internal serialization buffer if needed
   if (buffer.length < minInternalBufferSize) {
     buffer = new Buffer(minInternalBufferSize);
@@ -102,14 +102,15 @@ BSON.prototype.serializeWithBufferAndIndex = function(object, finalBuffer, optio
 
   // Attempt to serialize
   var serializationIndex = serializer(
-    finalBuffer,
+    buffer,
     object,
     checkKeys,
     0,
     0,
     serializeFunctions,
     ignoreUndefined
   );
+  buffer.copy(finalBuffer, startIndex, 0, serializationIndex);
 
   // Return the index
   return startIndex + serializationIndex - 1;