Integration with the share extension needs improvement. Right now

we've seen some odd bugs, and the way we modify the contents of the

.hg/shared file is unfortunate. See wrappostshare() and unsharenarrowspec().

Resolve commentary on narrowrepo.wraprepo.narrowrepository.status

about the filtering of status being done at an awkward layer. This

came up the import to hgext, but nobody's got concrete improvement

ideas as of then.

Fold most (or preferably all) of narrowrevlog.py into core.

Address commentary in narrowrevlog.excludedmanifestrevlog.add -

specifically we should improve the collaboration with core so that

add() never gets called on an excluded directory and we can improve

the stand-in to raise a ProgrammingError.

Figure out how to correctly produce narrowmanifestrevlog and

narrowfilelog instances instead of monkeypatching regular revlogs at

runtime to our subclass. Even better, merge the narrowing logic

directly into core.

Reason more completely about rename-filtering logic in

narrowfilelog. There could be some surprises lurking there.

Formally document the narrowspec format. Unify with sparse, if at all

possible. For bonus points, unify with the server-specified narrowspec

format.

narrowrepo.setnarrowpats() or narrowspec.save() need to make sure

they're holding the wlock.

Implement a simple version of the expandnarrow wireproto command for

core. Having configurable shorthands for narrowspecs has been useful

at Google (and sparse has a similar feature from Facebook), so it

probably makes sense to implement the feature in core. (Google's

handler is entirely custom to Google, with a custom format related to

bazel's build language, so it's not in the narrowhg distribution.)