Tests: Use unique data set keys in data_utf8_substrings()#12302

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Soean:fix/mb-substr-duplicate-data-provider-keys

Commits on Jun 24, 2026

Tests: Use unique data set keys in data_utf8_substrings()
Soean
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Compat: Make `_mb_substr()` return an empty string for out-of-range starts. In the non-UTF-8 byte-stream path, `_mb_substr()` delegates to `substr()`, which returns `false` for a start beyond the s…
Soean
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