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							- 'use strict';
 
- var global   = require('es5-ext/global')
 
-   , polyfill = require('../polyfill');
 
- module.exports = function (t, a) {
 
- 	var cache;
 
- 	a(typeof t(), 'boolean');
 
- 	cache = global.Set;
 
- 	global.Set = polyfill;
 
- 	a(t(), true);
 
- 	if (cache === undefined) delete global.Set;
 
- 	else global.Set = cache;
 
- };
 
 
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