typing: make minor adjustments to mercurial/util.py to pass pytype checking
I'm assuming the wrong-arg-count is a pytype bug, because this code is used by
the config object. Avoiding initializing `_lrucachenode` node points to None
eliminates a few `is not None` assertions, but apparently not all of them. I
can't figure out why it gets confused over the state where these new assertions
are.
Differential Revision: https://phab.mercurial-scm.org/D10276
Mercurial
=========
Mercurial is a fast, easy to use, distributed revision control tool
for software developers.
Basic install::
$ make # see install targets
$ make install # do a system-wide install
$ hg debuginstall # sanity-check setup
$ hg # see help
Running without installing::
$ make local # build for inplace usage
$ ./hg --version # should show the latest version
See https://mercurial-scm.org/ for detailed installation
instructions, platform-specific notes, and Mercurial user information.
Notes for packagers
===================
Mercurial ships a copy of the python-zstandard sources. This is used to
provide support for zstd compression and decompression functionality. The
module is not intended to be replaced by the plain python-zstandard nor
is it intended to use a system zstd library. Patches can result in hard
to diagnose errors and are explicitly discouraged as unsupported
configuration.