handlebars.runtime.js in handlebars-source-4.0.13 vs handlebars.runtime.js in handlebars-source-4.0.14

@@ -1,9 +1,9 @@
 /**!
 
  @license
- handlebars v4.0.13
+ handlebars v4.0.14
 
 Copyright (C) 2011-2017 by Yehuda Katz
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
@@ -205,11 +205,11 @@
 
 	var _logger = __webpack_require__(19);
 
 	var _logger2 = _interopRequireDefault(_logger);
 
-	var VERSION = '4.0.13';
+	var VERSION = '4.0.14';
 	exports.VERSION = VERSION;
 	var COMPILER_REVISION = 7;
 
 	exports.COMPILER_REVISION = COMPILER_REVISION;
 	var REVISION_CHANGES = {
@@ -798,10 +798,16 @@
 
 	exports.__esModule = true;
 
 	exports['default'] = function (instance) {
 	  instance.registerHelper('lookup', function (obj, field) {
-	    return obj && obj[field];
+	    if (!obj) {
+	      return obj;
+	    }
+	    if (field === 'constructor' && !obj.propertyIsEnumerable(field)) {
+	      return undefined;
+	    }
+	    return obj[field];
 	  });
 	};
 
 	module.exports = exports['default'];
 
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