Missing guard for duplicate class method declaration

[ceremcem]

Following class definition:

class a
  hello: ->
  there: -> 
  hello: -> 2

is compiled to following Javascript code without any exception thrown:

var a;
a = (function(){
  a.displayName = 'a';
  var prototype = a.prototype, constructor = a;
  a.prototype.hello = function(){};
  a.prototype.there = function(){};
  a.prototype.hello = function(){
    return 2;
  };
  function a(){}
  return a;
}());

...which doesn't prevent us erroneous re-definition of a method. I would expect a proper error, like duplicate property definition in an object:

a =
  hello: ->
  there: -> 
  hello: -> 2

# => duplicate property "hello" on line 4

Would you consider adding such a guard in class definitions?

[rhendric]

That makes sense to me. I can't think of any reason why it should be one way for classes but another way for objects.