- 'use strict';
 
- var uncurryThis = require('../internals/function-uncurry-this');
 
- var id = 0;
 
- var postfix = Math.random();
 
- var toString = uncurryThis(1.0.toString);
 
- module.exports = function (key) {
 
-   return 'Symbol(' + (key === undefined ? '' : key) + ')_' + toString(++id + postfix, 36);
 
- };
 
 
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