Implementations MUST prevent the creation of bags containing files which differ only in normalization form.
if this stays in the non-normative section 6 then I think it can only be a SHOULD. (Another approach would be to avoid RFC2119 words in the non-normative portion.)
Currently, 6.1.1.3. Recommendations includes:
if this stays in the non-normative section 6 then I think it can only be a SHOULD. (Another approach would be to avoid RFC2119 words in the non-normative portion.)