If it's accepted I'll be looking for someone to mentor to help with the implementation! :)

idea: frozenmap(collection, **kwargs) Creates a copy while patching it with kwargs

Yeah, that's in the pep :) Although I'm not sure if the reference implementation has a fast path if the collection arg is already a frozenmap.

I wonder if will be useful to include frozensets and frozenmaps directly into Python syntax using something like `f{}` (like strings have prefixes f, r, u). Then we would have frozenmap-comprehensions, easier construction with things like `f{**input1, **input2, key: value}`, etc.

I don't see something like that to be accepted until everybody is using frozendicts everywhere. :/

Looks amazing, will wait