Timothy Flynn e6b7c8cde2 LibUnicode: Consistently reject out-of-bounds segmenter indices ...

In the UTF-8 implementation, this prevents out-of-bounds access of the
underlying text data, as the ICU macro would essentially do something
akin to `text[text.length()]`.

The UTF-16 implementation already checks for out-of-bounds, but would
previously return 0. We now return an empty Optional in both impls. This
doesn't affect LibJS (the user of the UTF-16 impl), as it already does
bounds checking before invoking LibUnicode APIs.

2025-01-16 23:22:48 +01:00

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