Spec says: [[collation]] is a String value with the “type” given in Unicode Technical Standard 35 for the collation, except that the values "standard" and "search" are *not allowed*, while the value "default" is allowed.
Also test intl402/ch10/10.1/10.1.1_19_b.js expects "default" if "de-u-co-invalid" was passed in. I think that we need to say what happens when "standard" and "search" are specified in -co- extension (test expects "default" value). I couldn't find that in the spec. If the -co-value is not in the list<http://unicode.org/repos/cldr/trunk/common/bcp47/collation.xml>of allowed words test expects "default", but I think spec only covers value of *null*. I would add (with references): "If co Unicode extension has a value that is not in the bcp47 list, or the value is null, standard or search, we replace it with 'default'." If that's too strong, we can say that implementations are free to recognize any keyword, except for null, search and standard (those 3 get replaced with "default"). -- Nebojša Ćirić
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