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Generally, the results files for fn-unordered-mix-args seem to assume that unordered() is a no-op - which is likely to be true on many implementations but not all. However, any serialization of the result of fn:unordered ( ("a", xs:string(""), "b", "c")) must be exactly six characters long: 1 each for "a", "b", and "c"; and three for the single-space separators. In this case, if unordered() is a no-op, the result should be "a b c" not "a b c". The result file, like many others, also contains a trailing newline which should not be there.
Fixed the fn-unordered-mix-args-004 output. New line problem is fixed by Andrew separately.
Verified. Thanks, - Jerome