I implemented persistent, array-mapped Patricia trees in C a while ago:

    https://matthias.benkard.de/journal/118

It should be relatively straight-forward to build some Objective-C classes 
on top of that.  (There's a reason the memory management routines are named 
bpt_{retain, release, dealloc}. :))

You'll just need to do the hashing yourself if you want to build a hash map.

Matthias

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