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Malte UblandClaude Opus 5.5
7b8a07e0f2
lastIndexOf built the receiver's UTF-16 index map and converted positions
both ways even when the receiver is proven ASCII, where byte offsets are
UTF-16 indexes (indexOf already has this fast path). A short id such as
"bk_00042".lastIndexOf("_") cost about 200 instructions; the Hono
fixture's list endpoint does it 80 times per request.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>