django/django — pull request #3047 by mjtamlyn (2014-08-12 12:12:58+00:00)
Title: [wip] POC for #18757.

Make resolve_columns a permanent fixture, remove convert_values.

Current implementation passes on sqlite at least, but does destroy performance. Need a nicer converter-collection based approach. Also some tests that we can use the new override from_db_value, and that #21565 is fixed in the process.