tablesaw performance improvements

[ajwock]

No description provided.

[codspeed-hq]

Merging this PR will improve performance by ×2.2

⚡ 3 improved benchmarks
✅ 3 untouched benchmarks

Performance Changes

	Benchmark	BASE	HEAD	Efficiency
⚡	test_bench_compute_histogram[solution]	9.4 s	4.3 s	×2.2
⚡	test_bench_compute_histogram[baseline]	10.7 s	9.3 s	+15.38%
⚡	test_bench_find_matches[solution]	5.8 s	1.3 s	×4.4

Tip

Curious why this is faster? Comment @codspeedbot explain why this is faster on this PR, or directly use the CodSpeed MCP with your agent.

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_{Comparing ajwock:wdrew_pycon_2026 (6879352) with main (72790a0)}