GitHub isn't smart enough to guess that 'readme.md.txt' is the same as 'README.md', except on my terms.
The new language cache wasn't purged by uncache. (Subs-Cache.php)
Apparently, MySQL doesn't like being asked the unsigned keyword on bit fields. It should have been smart enough to ignore them, but whatever... (install.sql)

While I'm at it, minor regex simplifications. (install.php)