A maintenance release? Rick, the master of understatement as usual. All of us busted our butts, but particular praise should go to Derek and Paul, who (among many other things) rewrote the input library and significantly increased its awesomeness. In fact, security in CI on the whole is a considerable step up.
Here are some other notables:
- configurable character sets
- much better handling up uploads and mime types, particularly in “everyone’s favourite browser ™”
- autoloadable custom languages
- better (valid) docs with more functions and less typos
- massive bug stomps
OK, I guess that fits the definition of maintenance release, then why did it feel like so much work? 
