This reminds me that I've acclimatised to one specific test in the PHP interpreter test suite always failing on OS X. I should go and make it either not run on OS X, or modify it so it will actually pass. That way, when someone eventually actually breaks that function, they'll notice.
ICL also though that even if the standard said such and such index MUST start at 1 that they woudl start it at 0 - cue some nice divide by zero errors - Not surprised we don't have a UK Mainframe company any more.