I have a general question: it was my understanding that if we raise some exception from another exception, we don't need to specify any cause explicitly. I think that's the way it's formulated in the docs and I personally have found raise ... from ... quite informative on its own.

If a user wants to check the cause explicitly, I think they can use .__cause__ (as per the same docs).

So what am I missing here? :)

Some punctuation nitpicks in docstring, maybe not even justified :)