json: reject unicode on py2 as well This makes it consistent with the behavior on py3. Differential Revision: https://phab.mercurial-scm.org/D3536

dispatch: mask negative exit code recorded in blackbox log That's what we do for the exit code delivered to the environment.

dispatch: fix exit code of unhandled exception recorded in blackbox log Spotted by Martin von Zweigbergk. We might want to change the exit code to -1 (i.e. 255) because 1 means non-abort error in hg, but that's another issue.

tests: mark tests that fail when using chg as #require no-chg As far as I can tell, most of these failures are due to using $HGPORT, which it seems chg might be using itself? I don't know enough to debug these failures to fix them properly. Differential Revision: https://phab.mercurial-scm.org/D3562

py3: use pycompat.bytestr() instead of str() in extensions.py Differential Revision: https://phab.mercurial-scm.org/D3568

py3: use pycompat.bytestr() on bytes before %r-ing it Differential Revision: https://phab.mercurial-scm.org/D3567

py3: add b'' prefixes in tests/test-extension.t # skip-blame because just b'' prefixes Differential Revision: https://phab.mercurial-scm.org/D3564

py3: suppress the value returned by .write() calls These return values are not present on Python 2. Differential Revision: https://phab.mercurial-scm.org/D3563

tests: test failure reporting in blackbox code Differential Revision: https://phab.mercurial-scm.org/D3560

export: add -B option to select a bookmark Just like `hg email -B`, `hg strip -B`, supports -B in export to select a list of changesets reachable from a bookmark.