--- /dev/null
+'use strict';
+var weak = require('./_collection-weak');
+
+// 23.4 WeakSet Objects
+require('./_collection')('WeakSet', function(get){
+ return function WeakSet(){ return get(this, arguments.length > 0 ? arguments[0] : undefined); };
+}, {
+ // 23.4.3.1 WeakSet.prototype.add(value)
+ add: function add(value){
+ return weak.def(this, value, true);
+ }
+}, weak, false, true);
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