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The assertions do not take account of the possibility of hexadecimal character entity references being in upper case. <serialization-matches><![CDATA[<ffi norm="kd" ffi="&#(64259|xfb03);">A&#(64259|xfb03);nity</ffi>]]></serialization-matches> should be <serialization-matches><![CDATA[<ffi norm="kd" ffi="&#(64259|xfb03);">A&#(64259|xfb03|xFB03);nity</ffi>]]></serialization-matches> (presuming that no implementation would actually product xFb03 or xfB03!)
Corrected and committed. There is an additional deficiency in normalize-unicode-018 that I'm tracking down.
Confirmed fixed. Thanks.