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This test tests html-version="five". While the spec says that you should raise a serialization error when the *version* is not supported, this is a production-rule mismatch, as the syntax requires the value to be of type xs:decimal. As a result it is first an XTSE0020 (wrong attribute) and only later, if the attribute is valid but the version not supported, it'd be a SEPM0016. I think ;).
Discussed today at F2F XML Prague 2016, we agreed to this assessment, assigned bug to be fixed.
This was already fixed on 7 February by me. Closing bug entry.