gistfile1.js

var ObjectRange = Class.create(Enumerable, (function() {
  function initialize(start, end, exclusive) {
    // ...
  }
  
  function _each(iterator) {
    // ...
  }
  
  function include(value) {
    // ...
  }
  
  return {
    initialize: initialize,
    _each:      _each,
    include:    include
  };
})());


instead of

var ObjectRange = Class.create(Enumerable, {
  initialize: function(start, end, exclusive) {
    // ...
  },
  
  _each: function(iterator) {
    // ...
  },
  
  include: function(value) {
    // ...
  }
});