I'm trying to automatically generate the KVC-compliant methods for indexed to-many relationships.  

Here's my current attempt, https://gist.github.com/1374142, which borrows from hotcocoa's kvo_array (I couldn't get `kvo_array` to work and I wanted something that could just automatically be backed by an Array).

Anyways, countOf<Key> and objectIn<Key>AtIndex: are both generated and work.

However, when I try and use valueForKey(<key>) on my generated keys, MacRuby crashes with:

It is my understanding this should return an array based on my countOf<Key> and objectIn<Key>AtIndex: methods.

On the other hand, when I use the manually defined methods, valueForKey(...) works as expected.

Is there an issue with my code/approach or is this a MacRuby bug?

Thanks,