Fix serializedobject append for excessively large bytes length

src/serializedobject.js

@@ -140,10 +140,9 @@ SerializedObject.prototype.append = function(bytes) {
   // Make sure both buffer and bytes are Array. Either could potentially be a
   // Buffer.
   if (Array.isArray(this.buffer) && Array.isArray(bytes)) {
-    // Array::concat is horribly slow where buffer length is 100 kbytes + One
-    // transaction with 1100 affected nodes took around 23 seconds to convert
-    // from json to bytes.
-    Array.prototype.push.apply(this.buffer, bytes);
+    for (var i = 0; i < bytes.length; i++) {
+      this.buffer.push(bytes[i]);
+    }
   } else {
     this.buffer = this.buffer.concat(bytes);
   }