rem: }, 
add: } 
context:   zip: function() {    var iterator = Prototype.K, args = $A(arguments);    if (typeof args.last() == 'function')      iterator = args.pop();    var collections = [this].concat(args).map($A);    return this.map(function(value, index) {      iterator(value = collections.pluck(index));      return value;    });  },
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