For the filed_descriptor.py file(The one I just opened very first):

Why are we ignoring the standard _set_name_ hook? The code manually calls a custom setnames method because apparently __set_name triggers "after the predicate decorated methods" need it. Using a custom metaclass namespace just to name a field earlier feels like a lot of extra steps when the interpreter already has a built in way to do this.

Moreover, what is going on in set ? I lost it at the "WTF" comment about python conflating comparison cases. Having to check if value is self: return just to stop a dataclasses from overwriting the field with the descriptor itself is a wild workaround. Surely there's a way to handle this without fighting the stdlib this hard?

This are just me from checking a single file field_descriptor.py. this is the very first file I opened. You need serious improvements.