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NeilandOrca
8fd517963a
The terminal RPC path counted UTF-8 bytes with a hand-rolled per-code-point scan that Buffer.byteLength does natively an order of magnitude faster. Routed through a small module rather than swapping the shared clipboard helper, which has ~50 renderer call sites and a partial-count contract on the over-limit path that must not change. 4.4x on an 8KiB batcher push, 4.2x on a 2MiB snapshot scan, 4.0x on the 48KiB chunk gate, and 1.26-1.33x on the adversarial early-trip shapes where the legacy scan bails after a third of the string. The floor is load-bearing, not defensive. Buffer.byteLength has a fixed ~14ns call cost against a scan iteration of ~1.5ns, so below the measured 8-12 code unit crossover the native call is a REGRESSION -- 4.2x slower at one code unit, which is keystroke echo, the most latency-sensitive PTY shape there is. Short inputs keep the scan verbatim; 16 leaves margin over the crossover so the worst sub-floor shape stays at parity. measureTerminalStreamByteLength takes the native count only when `length * 3 <= stopAfterBytes` proves the limit cannot trip, so the callers' truncated running total is never replaced by a full count. Co-authored-by: Orca <help@stably.ai>