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							- 'use strict';
 
- var tryToString = require('../internals/try-to-string');
 
- var $TypeError = TypeError;
 
- // Perform ? RequireInternalSlot(M, [[MapData]])
 
- module.exports = function (it) {
 
-   if (typeof it == 'object' && 'size' in it && 'has' in it && 'get' in it && 'set' in it && 'delete' in it && 'entries' in it) return it;
 
-   throw new $TypeError(tryToString(it) + ' is not a map');
 
- };
 
 
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