typing: add type hints to `mercurial.dirstatemap` Somewhere since 10db46e128d4, pytype stopped being able to infer the type of the `identity` field. Fill in some obvious other hints along the way. These hints caused pytype to flag a missing attribute: File "/mnt/c/Users/Matt/hg/mercurial/dirstatemap.py", line 714, in _v1_map: No attribute 'stat' on mercurial.windows.cachestat [attribute-error] In Union[Any, mercurial.posix.cachestat, mercurial.windows.cachestat] File "/mnt/c/Users/Matt/hg/mercurial/dirstatemap.py", line 715, in _v1_map: No attribute 'stat' on mercurial.windows.cachestat [attribute-error] In Union[Any, mercurial.posix.cachestat, mercurial.windows.cachestat] In practice, the `identity` field is NOT replaced with None if it isn't cacheable, so it's probably safer to just add the field and set it to None, since that check is already in place on line 715.

typing: add type hints to `cmdutil.findrepo()` Since 10db46e128d4, pytype almost figured this out, going from `Any` -> `_T0`, but the intent is obvious.

typing: add some type hints to fastannotate that have decayed in the last year Somewhere since 10db46e128d4, `_knownopts` decayed to `set` for unknown reasons. Also, `annotateopts.default` changed from bytes to str. While that is correct, I noticed that PyCharm was flagging the member fields as undefined in `shortstr()`, so add those to keep it happy. (There are no complaints from pytype because that module is excluded, due to the missing reference to `linelog.copyfrom()` that I'm not sure how to fix.)