On Fri, Feb 26, 2021, at 7:53 AM, Kjetil Torgrim Homme wrote:
> [...] If> one puts the URL aside as a convenience, the reference for> [Emoji-Seq] points to UTS#51, which clearly allows single-code> point [1] emoji and even some traditional symbols. On the other> hand, the link is to> at least today, is rule ED-17 of the Version 13.1, 2020-09-18> version of UTS#51. It points back to ED-15 for> <emoji_core_sequence> which rather clearly (at least IMO) allows> a single emoji character, which leads to ED-3 and single code> point emoji. So, probably that is consistent in the document.> Whether it is reasonable to expect anyone implementing the I-D> to search through that is another question but is part of my> concern about incorporating UTS#51 by reference and moving on.
For what it's worth, I'm the one who provided the reference to UTS51, and did so only after carefully making sure it allowed a single-code-point emoji, after a citation in a previous version (possibly only mentioned on list) pointed to something that only allowed multi-code-point sequences (to my bafflement).
Then there is the discussion of "what if somebody sticks `J` into the reaction part".
Kjetil wrote:
Existing text + suggested clarification:Reference to unallocated code points SHOULD NOT be treated as anerror; associated bytes SHOULD be processed using the system defaultmethod for denoting an unallocated or undisplayable code point.+ Code points from the private use area MUST NOT be used.+ Other violations of the grammar SHOULD cause the part to be+ discarded.
I agree with the spirit of this change: supply a simple "what if this part doesn't fits its constraints" case. I think the language you provide is adequate. The other behavior that comes to mind is to only discard part-contents in places where "emoji" is expected, but that does not meet the criterion of matching the emoji token. That is, given the part content:
\N{FOX FACE} J \N{DISGUISED FACE}
Discard the J, and not the rest. (Actually, "discard" here is probably better as "treat as an invalid codepoint".)
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rjbs
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