pytype: stop excluding upgrade.py The sole failure here was this, which is fixed by simply creating a set like the caller, instead of a dict: File "/mnt/c/Users/Matt/hg/mercurial/upgrade.py", line 73, in upgraderepo: No attribute 'discard' on Dict[nothing, nothing] [attribute-error] In Union[Any, Dict[nothing, nothing]] Differential Revision: https://phab.mercurial-scm.org/D11911