From Jason Turner

[uaxid.def.stable]

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+ ### R1b Stable identifiers <a id="uaxid.def.stable">[[uaxid.def.stable]]</a>
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+
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+ An implementation of UAX \#31 may choose to guarantee that identifiers
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+ are stable across versions of the Unicode Standard. Once a string
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+ qualifies as an identifier it does so in all future versions.
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+
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+ C++ does not make this guarantee, except to the extent that UAX \#31
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+ guarantees the stability of the XID_Start and XID_Continue properties.
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+