You could also use a TypedDict for that, though?

PEP 764[0] will make them extra convenient.

[0]: https://peps.python.org/pep-0764/

Typing is declarative

In the end, it ensures nothing and accepts everything

  $ cat test.py
  from typing import TypedDict
  class MyDict(TypedDict):
        some_bool: bool
  print(MyDict(some_bool="test", unknown_field="blabla"))

   $ ./test.py
   {'some_bool': 'test', 'unknown_field': 'blabla'}