seems like the actual types that define Python behavior like collections.abc.Mapping are missing from the default resolvers, and instead some random collection of builtin types is there:

I say “random” because MappingProxyType, KeysView, … are just as fundamental Python types that are used whenever something as basic as a class is encountered so I can’t think of a reason why they shouldn’t be there when dict is, let alone some Django classes and other stuff!

But as initially said: Python’s behavior is actually defined by collections.abc.* classes, so instead of having random builtin sequences like list, frozenset, … in the defaults, why not just use collections.abc.{Sequence,Mapping,Set} directly?

PS: #825 was closed because its title asked about this being possible. I know it’s possible and ask for it to be changed instead.