Zend API changes

A small point I'd like to raise here. I noticed 4.0.5 made a change to the arguments of zend_hash_get_current_key by adding a "dupe" argument to the define and underlying function. This of course broke any external custom modules that are not changed appropriately. In this case the change was very simple, but it raises a good question... Are there some guidelines independent external modules can follow to remain more compatible between releases? I'm not questioning the right or need for underlying Zend API changes, obviously when such changes are made all functions inside the PHP collection are change accordingly. But are there suggestions to minimize these in the future and get better notified when they do occur? Thanks, Brian