Under the hood
Useful1 Signal0
Trimming text to a byte limit got cheaper, with the same results.
What's wrong with this entry?
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What
The helper that trims a string to a byte budget now returns early when three bytes per character would still fit, and otherwise encodes and decodes with TextEncoder/TextDecoder, stripping any trailing replacement character left by a cut mid-sequence. Same results, less allocation.
Evidence
new TextDecoder().decode(r.subarray(0, t)).replace(/\uFFFD+$/, "")
Strings lifted out of the shipped bundle, so the claim above can be checked against them.