[gte910h]

The title confused me: It was redefinition of a GC related function that lead to the bug. It has nothing to do with the existence of a GC on iOS.

[asarazan]

I was going for more of a sly joke with the title, but it appears to have not gone over well. I now regret my decision.

[mikeash]

Actually not a redefinition, as that function has had the same behavior since it was introduced. It's just code that's incorrect when run with reference counting.