--- /dev/null
+'use strict';
+var strong = require('./_collection-strong');
+
+// 23.2 Set Objects
+module.exports = require('./_collection')('Set', function(get){
+ return function Set(){ return get(this, arguments.length > 0 ? arguments[0] : undefined); };
+}, {
+ // 23.2.3.1 Set.prototype.add(value)
+ add: function add(value){
+ return strong.def(this, value = value === 0 ? 0 : value, value);
+ }
+}, strong);
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