Re:
<https://github.com/jsshapiro/swift-evolution/blob/unicode-id-op/proposals/NNNN-refining-identifiers-and-operators.md>
### Conventional Identifiers
`conventional-ident-head → [:Emoji:]`
will include the keycap base characters ('#', '*', ASCII digits).
<http://www.unicode.org/Public/emoji/4.0/emoji-data.txt>
<http://www.unicode.org/Public/emoji/4.0/emoji-sequences.txt>
Does the NFC format prevent emoji ZWJ sequences?
<http://www.unicode.org/Public/emoji/4.0/emoji-zwj-sequences.txt>
### Symbol Identifiers
You could include both blocks of mathematical operators.
* U+2200 ... U+22FF [:Block=Mathematical_Operators:]
* U+2A00 ... U+2AFF [:Block=Supplemental_Mathematical_Operators:]
-- Ben
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