feat(yp): faster typescript serialization#23713

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cb/spike-tx-write-interface

Commits on May 30, 2026

refactor(stdlib): streaming toBuffer(sink?) serialization for the Tx path
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Commits on May 31, 2026

perf(stdlib): hot-path serializeToSink dispatch and cache Fr bytes for ~9x Tx.toBuffer
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perf(stdlib): drop Fr byte cache (regresses cold path), add cold-tx bench
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perf(stdlib): specialized field writers and cross-instance sink-size hint
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chore(stdlib): prettier on buffer_sink.ts
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test(yp): unit tests for BufferSink serialization path

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claude
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perf(yp): limb-based BufferSink.writeBigInt for all widths
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chore(yp): prettier on buffer_sink.test.ts
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refactor(stdlib): replace Tx sink-size WeakMap with a static 128 KiB constant
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test(yp): fix buffer_sink writeBigInt(_, 7) case to use a width-fitting value
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