[ot][spam][crazy][random][crazy]

[Undescribed Horrific Abuse, One Victim & Survivor of Many]

[user@ flat_tree]$ vim flat_tree/__init__.py

then, down at the bottom ...

#flat_tree = flat_tree_mix_indices_oo
flat_tree = flat_tree_append_indices

So the test isn't actually using mix_indices. It's instead using
append_indices, the older form that is supposed to be more stable. I
must have broken it, then resonated discouragement with inhibition etc
and failed to continue, had amnesia, etc etc.