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Unicode segmenter performance #1703

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Unicode segmenter performance #1703

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Commits on Aug 12, 2024

  1. Adopt uax29 segmenter 

    Replacing blevesearch/segment. ~2x throughput improvement. Refactor allocations, now ~O(1).

Add tests & multilingual sample text to ensure identical behavior. Known differences from previous segmenter:
- The original segmenter splits runs of spaces into separate tokens; uax29 concatenates runs into a single token.
- The original segmenter doesn’t handle emoji skin tone modifiers, the new one does, attributable to Unicode version update.
    @clipperhouse
    clipperhouse committed Aug 12, 2024
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