[diegojromero]

I'd really love if that could checked statically.

Performance is bad, I mean, all params are deep-copied because I assume frozen then "inplace" is not intended as they could be objects used by other parts of code.

[nickysielicki]

I started googling around and I found the following: https://www.python.org/dev/peps/pep-0591/

It looks like mypy can actually understand the hint: https://mypy.readthedocs.io/en/stable/final_attrs.html

It sucks that this would require such a substantial effort throughout a codebase, though. I guess that’s just the inherent cost of typed python.

[diegojromero]

Interesting, maybe adding a decorator @freeze_final could be a good idea? I'll take a look at it later.

Thank you for your input!