Follow-up Comment #5, bug #61998 (group groff): To address the comment "TODO: Find a source for that" added in the commit cited in comment #4:
The sentence from the Unicode standard I quoted in comment #0 ("For most
purposes, it is preferable to compose the Roman numerals from sequences of the
appropriate Latin letters.") was probably pulled from the Wikipedia article
linked in that paragraph, which itself cites
https://www.unicode.org/versions/Unicode6.0.0/ch15.pdf for that quote. That
sentence appears in section 15.3, "Number Forms."
Unicode 6 is old; however, the same sentence appears in Unicode 17, in section
22.3.4, "Acrophonic Systems and Other Letter-based Numbers"
(http://www.unicode.org/versions/Unicode17.0.0/core-spec/chapter-22/#G42902).
I surmise the sentence has appeared in every Unicode revision between those
two as well.
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