Subject: 21559 not fully fixed

From: Andrew Ruder <[email-masked]>
Date: Mon, 24 Sep 2018 22:28:07 -0700

unarchive 21559
reopen 21559
thanks

The analysis in this ticket is great, but still missing another edge
case for GIT_OPTIONAL_LOCKS.  I have patch and explanation, can attach
to ticket when open.

- Andrew Ruder
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