[jquast]

Use the same UB stance that is used for ZWJ: RI's are placed in pairs so we can more simply track ri_unpaired, and ri_unpaired_before to more rapidly determine RI pairs. This means it might get it "wrong" for invalid unicode sequences, like combining characters with RI's, but we don't care to try measure about that correctly.

[codspeed]

Merging this PR will improve performance by ×5.6

1 warning

⚠️ Base and head ran on different runner types

Some benchmarks with significant performance changes were compared across different runner types, so the changes might not come from the code. Run base and head on the same runner type, or use CodSpeed Macro Runners for more stable results.

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⚡ 8 improved benchmarks
✅ 129 untouched benchmarks

Performance Changes

	Benchmark	BASE	HEAD	Efficiency
⚡	test_wcswidth_ri_flags_paired	432.3 µs	35.4 µs	×12
⚡	test_width_ri_flags_paired	438.1 µs	41 µs	×11
⚡	test_wcstwidth_ri_term_program[ghostty]	471.8 µs	74.1 µs	×6.4
⚡	test_width_ri_term_program[ghostty]	476.7 µs	79.2 µs	×6
⚡	test_wcswidth_ri_flags_unpaired	129 µs	32 µs	×4
⚡	test_width_ri_flags_unpaired	132.8 µs	36 µs	×3.7
⚡	test_wcstwidth_ri_term_program[xterm.js]	554.1 µs	156.4 µs	×3.5
⚡	test_width_ri_term_program[xterm.js]	559.1 µs	161.4 µs	×3.5

Tip

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

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_{Comparing jq/quadratic-reverse-RIs (4417107) with master (2a8edf1)}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.12%. Comparing base (2a8edf1) to head (4417107).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #304      +/-   ##
==========================================
+ Coverage   88.09%   88.12%   +0.02%     
==========================================
  Files          41       41              
  Lines        5654     5632      -22     
  Branches     1520     1508      -12     
==========================================
- Hits         4981     4963      -18     
+ Misses        319      318       -1     
+ Partials      354      351       -3     

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