Thank you for your review Eric.

I made error in commit messages, that is why they are non shown here. odict_revert_setting_on_error.patch and odict_iternext_simpler.patch were committed in 1594c23d8c2f and ad44d551c13c.

od_resize_sentinel2 in odict_resize_sentinel.patch was renamed to od_fast_nodes_size. Now I see that this is not enough. It is possible that ma_keys is located on the same place, has the same size, but has different layout for keys with matched hashes. I'm trying to write more reliable checks.