Regression fixed: Force the ID to be a String

Author: SeyZ

lib/serializer-utils.js

@@ -274,7 +274,7 @@ module.exports = function (collectionName, record, payload, opts) {
 
     // Top-level data.
     var data = { type: getType(collectionName, record) };
-    if (record[getId()]) { data.id = record[getId()]; }
+    if (record[getId()]) { data.id = String(record[getId()]); }
 
     // Data links.
     if (opts.dataLinks) {