Just a quick note to say that I have been using @BYK 's D15675, D15676 and D15693 for over a month now with no issues, so would be in favour of them being merged in.
Setup:

• Windows 10 x64,
• standalone cmd.exe
• cmd.exe through ConEmu
• git repos hosteded locally in phabricator (running on Ubuntu server)
• relatively straightforward use of arc feature, arc diff and arc land