Merge pull request #780 from njovin/dev

Allow isReserved() to handle non-string inputs

src/util/lang.js

@@ -6,7 +6,7 @@
  */
 
 exports.isReserved = function (str) {
-  var c = str.charCodeAt(0)
+  var c = (str + '').charCodeAt(0)
   return c === 0x24 || c === 0x5F
 }