Add StringIndex: a generic open-addressed string set#11660

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Commits on Jun 23, 2026

Rename TagSet to StringIndex

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Drop benchmarks from StringIndex PR; revert SetBenchmark/UnsynchronizedMapBenchmark

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Commits on Jun 24, 2026

Add JOL retained-footprint test for StringIndex vs JDK sets

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Note StringIndex's footprint-for-throughput tradeoff in class Javadoc

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Correct StringIndex Javadoc: 2x sizing is for build simplicity, not throughput

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