I found this thread from 2011, which states that there is [was] no support for the Zend PDO adapter. However, I just enabled in on 1.3.1, and it appears to be working. Is this "officially supported", "unsupported but probably working", or "unlikely to work properly"? I suspect that switching to PDO may fix some occasional MySQL hiccups that we're seeing, so I'd appreciate knowing if it's worth switching. I'm not against a little hacking around, if necessary.