var id = 0;
module.exports = function(key){
  return 'Symbol('.concat(key === undefined ? '' : key, ')_', (++id + Math.random()).toString(36));
};
@@ -3,16 +3,39 @@
 r id = 0
+%0A  , px = Math.random()
 ;%0Amodule
@@ -130,29 +130,18 @@
 (++id + 
-Math.random()
+px
 ).toStri

use one random postfix for all symbols