--- /dev/null
+// 22.1.3.31 Array.prototype[@@unscopables]
+var UNSCOPABLES = require('./_wks')('unscopables')
+ , ArrayProto = Array.prototype;
+if(ArrayProto[UNSCOPABLES] == undefined)require('./_hide')(ArrayProto, UNSCOPABLES, {});
+module.exports = function(key){
+ ArrayProto[UNSCOPABLES][key] = true;
+};
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