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Ran 01 Sep 2026 09:19AM UTC

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Committed 01 Sep 2026 09:17AM UTC coverage: 90.983% (-0.001%) from 90.984%

Build # 6492

Build Type

push

github

Committed by

bobzhang

Commit Message

refactor(encoding/utf16): drop the dead leading surrogate checks

`utf16_needs_scalar_le_v128` and its BE twin each tested the first code unit
for a surrogate before entering the scan loop. That test can never fire:

- with >= 16 bytes left the first arm checks all eight code units of the
  block, including the first, via `utf16_v128_has_surrogate`;
- with fewer, the `[u16le(0xD800..=0xDFFF), ..]` arm catches the first code
  unit itself.

The check predates the bitstring rewrite, where the loop's own arms took over
the job. Remove it from both functions. No behavior change; the oracle tests
in `quickcheck_test.mbt` — including "a surrogate at every position of a
vectorized block" — cover the first-code-unit case.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_013wPGhicD5xMW9xH5Uk56iK

Coverage Stats

16861 of 18532 relevant lines covered (90.98%)

283433.33 hits per line

Jobs

ID	Job ID	Ran	Files	Coverage
1	6492.1	01 Sep 2026 09:19AM UTC	454	91.0	GitHub Action Run

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