martijnwalraven/RestKit — comment on commit 4c3581f4c7b594ffb9b3199cbb67862281c4e82f
File:  line 0
By blakewatters:

We were using the proxy objects because of compatibility with key-value observing. Mutation of the entire collection would not fire a change on the observed collection keyPath. This may well have changed with iOS 5 -- I haven't looked into it.