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## R2 Immutable identifiers <a id="uaxid.immutable">[[uaxid.immutable]]</a>
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An implementation may choose to guarantee that the set of identifiers
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will never change by fixing the set of code points allowed in
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identifiers forever.
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C++ does not choose to make this guarantee. As scripts are added to
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Unicode, additional characters in those scripts may become available for
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use in identifiers.
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