py3: make a pycompat.osdevnull, use it in extdiff Differential Revision: https://phab.mercurial-scm.org/D7545

subrepo: use pycompat.open directly instead of importing open from pycompat Differential Revision: https://phab.mercurial-scm.org/D7544

rust-dirs: address failing tests for `dirs` impl with a temporary fix https://phab.mercurial-scm.org/D7252 (5d40317d42b7083b49467502549e25f144888cb3) introduced a regression in Rust tests. This is a temporary fix that replicates the behavior of the C and Python impl, pending the resolution of the discussion (in the phabricator link) about how we actually want to solve this problem. Differential Revision: https://phab.mercurial-scm.org/D7503

cleanup: fix docstring formatting This is just removing the b'' prefix (except demandimportpy2), and making sure it is triple quoted. I skipped the mapping.py module in zope because that's 3rd party code. Differential Revision: https://phab.mercurial-scm.org/D7539

copies: split the combination of the copies mapping in its own function In some case, this part take up to 95% of the copy tracing that take about a hundred second. This poor performance comes from the fact we keep duplciating and merging dictionary that are mostly similar. I want to experiment with smarter native code to do this, so I need to isolate the function first.

copies: do not initialize the dictionary with root in changeset copies We don't strictly need the dict to be prefiled with `{}`. Not doing so will make the next changeset simpler. This part of a preparation to use native code for this part of copy tracing.

copies: expand `_chain` variable name to make the function easier to read This came up while explaining what the function is about. I find the function easier to follow that way.

copies: show we can read data from the "first" mapping In practice this make no difference since `t` is a copy of `a`. Having this change before hand will make the next cleanup changeset clearer. This is work on the road to using some native code for some performance critical part of copy tracing.

copies: return consistent type from revinfo The return is expected to be a list, so we should return a list. This make the use of this function from type-checked language (eg: rust) much simpler.

dateutil: correct default for Ymd in parsedate The code uses `0` for the default value of Ymd (year, month, and day), which seems suboptimal. For example, these will fail to parse: dateutil.parsedate('2000', formats=dateutil.extendeddateformats) dateutil.parsedate('Jan 2000', formats=dateutil.extendeddateformats) Fix it by providing sane defaults (1 instead of 0) for year, month, and day. The suboptimal behavior was introduced by 91bc001a592 (2010-12-29, "date: fix matching of underspecified date ranges"), which does not seem to justify the current behavior. Note end-users should not notice the subtle issue, because there are no formats in `defaultdateformats` that allow an explicit year with omitted month, or an explicit month with omitted day. Differential Revision: https://phab.mercurial-scm.org/D7520