> > So, it's expected that `some_module` and `v` would be in the locals at this point.

> If a function does not have the local variables `some_module` and `v`, then the change wouldn't be visible to the debugee.
So what difference does it make?

Right now such changes are visible to the debugee in the locals frames if a user does the `exec` and calls `PyFrame_FastToLocals` right afterwards (even if they weren't initially there).

So, it's the difference between being able to import a module and creating/manipulating new variables in an `exec` in any frame (as it works right now) or not being able to make it at all (if that feature is deprecated as is being implied in the PEP).