[uaxid.def.stable] (original) (raw)

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

E.2 R1 Default identifiers [uaxid.def]

E.2.3 R1b Stable identifiers [uaxid.def.stable]

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An implementation of UAX #31 may choose to guarantee that identifiers are stable across versions of the Unicode Standard.

Once a string qualifies as an identifier it does so in all future versions.

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C++ does not make this guarantee, except to the extent that UAX #31 guarantees the stability of the XID_Start and XID_Continue properties.