scmutil: clean up bytes/string cache decorator mess on Python 3 again
The previous fix to this area worked, but was dropping bytes in
__dict__ on Python 3. This was causing subtle breakage in
test-check-interfaces.py, and probably other things too.
Fixed now.
Differential Revision: https://phab.mercurial-scm.org/D3464
Mercurial
=========
Mercurial is a fast, easy to use, distributed revision control tool
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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
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