Version 1507 was commited by steve on 2010-01-23 16:35:31 +0000 (Sat, 23 Jan 2010) Undo the commits 1488, 1498, 1499. These will be re-applied to the style branch. It seems like a good idea to also pull an available EQUALS to the front ahead of an EXISTS. This was the behaviour prior to these patches and may help performance - it certainly reduced the randomness of the action evaluation order somewhat.