Let's also:
* Add a large comment to each such change, justifying it clearly
* Add all the code to docs/DJANGO-CHANGES.txt, with the file and line number of the change
* Insert a consistent keyword marker (a la BUG, TODO, etc), to allow for easy searching.
* Locate that keyword marker at the first line (which is reported in the text file)

I've done this for these two changes.