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node_modules/core-js/modules/es.set.constructor.js

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+'use strict';
+var collection = require('../internals/collection');
+var collectionStrong = require('../internals/collection-strong');
+
+// `Set` constructor
+// https://tc39.es/ecma262/#sec-set-objects
+collection('Set', function (init) {
+  return function Set() { return init(this, arguments.length ? arguments[0] : undefined); };
+}, collectionStrong);