I'm testing out the current SMW 1.4 code in SVN; so far everything seems to be working fine, except for a problem with date parsing. The system now rejects dates of the form "January 1, 2008"; though it accepts "January 1 2008", without the comma. The former, though, is much more common in the American date format, and in fact it's what Semantic Forms' date input produces, when the wiki has $wgAmericanDates set to true. Can this be fixed?