rem: function(valsOnly) 
add: function(keysOnly) 
context:   iterable.__iterator__ =    function(valsOnly)    {      var gen =        function()        {          for (var i = 0; i < keys.length; i++)          {            if (valsOnly)              yield vals[i];            else              yield [keys[i], vals[i]];          }        };      return gen();    };
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