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  perf/frame-decoder-zero-copy-extract
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perf(start-client-core): zero-copy frame payload extraction extractFlattened() always allocated a new Uint8Array and copied `count` bytes, even when the requested bytes were fully contained in the first buffered chunk (the common case, since most frames arrive within a single network read). Add a fast path that returns a subarray view of the first chunk when the bytes are contiguous, avoiding the allocation and the byte copy. The multi-chunk path is unchanged. The returned view shares the chunk's backing ArrayBuffer, which is safe because buffered chunks are never mutated in place after being read. This is on the hot path for decoding every streamed server-function response and RawStream binary payload on the client. A micro-benchmark shows ~3x faster extraction for 1KB frames and ~27x for 64KB frames (the win scales with payload size).

nx affected --targets=test:eslint,test:unit,test:e2e,test:types,test:build,build --parallel=3

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