Annex E (informative)
Conformance with UAX #31
[uaxid]
E.2
R1 Default identifiers
[uaxid.def]
E.2.3
R1b Stable identifiers
[uaxid.def.stable]
1
#
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
.
2
#
C++ does not make this guarantee, except to the extent that UAX #31 guarantees the stability of the XID_Start and XID_Continue properties
.