Be even safer by getting a hasOwnProperty reference early

hapijs/bourne#7 (comment)

Author: rgrove

lib/index.js

@@ -1,5 +1,6 @@
 'use strict';
 
+const hasOwnProperty = Object.prototype.hasOwnProperty;
 
 const internals = {
     suspectRx: /"(?:_|\\u005f)(?:_|\\u005f)(?:p|\\u0070)(?:r|\\u0072)(?:o|\\u006f)(?:t|\\u0074)(?:o|\\u006f)(?:_|\\u005f)(?:_|\\u005f)"\s*\:/
@@ -65,7 +66,7 @@ exports.scan = function (obj, options) {
         next = [];
 
         for (const node of nodes) {
-            if (Object.prototype.hasOwnProperty.call(node, '__proto__')) {
+            if (hasOwnProperty.call(node, '__proto__')) {
                 if (options.protoAction !== 'remove') {
                     throw new SyntaxError('Object contains forbidden prototype property');
                 }