I like the idea and am another person that would definitely use it if such a thing existed, but I agree that parse already makes this kind of thing pretty easy to do.

I've at times wondered if something like parse should just become part of the std lib. It seems like a library that could be made to be pretty stable, and it doesn't seem like it is likely to grow many more features than it already has.. from what I understand at least. So keeping it outside the std lib to allow those features can evolve (which is the main argument for keeping, for example, pytest out of the std lib, and for a long time was the argument for attrs until dataclasses came along). 

+0.