phabricator: auto-sanitise API tokens and HTTP cookies from VCR recordings Currently when making VCR recordings one needs to manually sanitise sensitive credentials before committing and submitting them as part of tests. It is easy to imagine this being accidentally missed one time by a fallible human and said credentials being leaked. It is also possible that it wouldn't be noticed to alert the user to the leak since the recording files are so large and practically unreviewable. Thus do so automatically, so the only place that needs checking is in the test-phabricator.t file. Differential Revision: https://phab.mercurial-scm.org/D6513

py3: use .startswith() instead of bytes[0] Doing bytes[0] will return the ascii value of that position which breaks comparison with a bytechar. This makes test-absorb.t work again on py3. Differential Revision: https://phab.mercurial-scm.org/D6508

revset: fix merge() to fall back to changectx API if wdir specified I have a code which basically runs "0:wdir() & <user-revset>", and it crashed if merge() were passed in.