typing: add a few type hints to `mercurial/revlog.py`
Somewhere between hg
3dbc7b1ecaba and hg
8e3f6b5bf720, pytype stopped being able
to infer the type for `_docket_file` and `compress()`. Lock those types in
before they get lost.
= Mercurial XXX =
== New Features ==
== Default Format Change ==
These changes affect newly created repositories (or new clones) done with
Mercurial XXX.
== New Experimental Features ==
== Bug Fixes ==
== Backwards Compatibility Changes ==
== Internal API Changes ==
== Miscellaneous ==