Minor annoyances that we have worked around in our own branch.

Two commits fix real bugs:
65db5eb (running in production since Jan 18th 2012)
3531c94 (running in production since July 1st 2014)

The other two fix issues when using ADODB with HHVM and MySQL/PostgreSQL. These shouldn't have any negative side effects as they are either default settings not handled the same in HHVM as PHP or pre-PHP v4.2 function calls:
223f794 (running in production since February 2nd 2014)
11cc00c (running in production since February 2nd 2014)

"In production" refers hundreds of thousands of downloads of our own project and millions of users.