There are several issues in the backwards-compatible milestone related
to Unicode identifiers:
#4928: XID_Start/XID_Continue might not be correct
#2253: Do NKFC normalization in lexer
Given the extreme lack of use of Unicode identifiers and the fact that
we have much more pressing issues for 1.0, I propose putting support for
identifiers that don't match /^(?:[A-Za-z][A-Za-z0-9]*|_[A-Za-z0-9]+)$/
behind a feature gate.
Thoughts?
Patrick
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