is-implemented.js 247 Bytes
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'use strict';

module.exports = function () {
	var isSafeInteger = Number.isSafeInteger;
	if (typeof isSafeInteger !== 'function') return false;
	return !isSafeInteger('23') && isSafeInteger(34232322323) &&
			!isSafeInteger(9007199254740992);
};