[Robustness] formats: cache String#replace

Author: ljharb

lib/formats.js

@@ -1,10 +1,13 @@
 'use strict';
 
+var replace = String.prototype.replace;
+var percentTwenties = /%20/g;
+
 module.exports = {
     'default': 'RFC3986',
     formatters: {
         RFC1738: function (value) {
-            return String(value).replace(/%20/g, '+');
+            return replace.call(value, percentTwenties, '+');
         },
         RFC3986: function (value) {
             return value;