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Tests such as format-date-037 include a grouping separator. <test>format-date(xs:date('2016-01-01'), '[Y# $ 0,3-3]')</test> which I think cosigns the result to the realms of the implementation-defined (see 9.8.4.3 Formatting Integer-Valued Date/Time Components). I think the following are affected. format-date-037 format-date-040 format-date-046 format-date-047
I've taken the liberty of fixing these tests.