> If a user unknowingly creates such a module with an unencodable
> filename, will they understand why pydoc does not display it?

It is really a bad idea to choose an *undecodable* name for a module. You will not be able to write its name using "import name" syntax.

(It is possible to import such module using __import__, but it is just ugly)

For the changelog, feel free to rephrase it.