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Annex E (informative) Conformance with UAX #31 [uaxid]

E.3 R2 Immutable identifiers [uaxid.immutable]

1
#
An implementation may choose to guarantee that the set of identifiers will never change by fixing the set of code points allowed in identifiers forever.
2
#
C++ does not choose to make this guarantee.
As scripts are added to Unicode, additional characters in those scripts may become available for use in identifiers.