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Commits on Jun 2, 2026

• [JSC] Add foundation of handling builtin iterators in fast-iteration-protocol

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Commits on Jun 1, 2026

• [JSC] Add String fast iteration

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  sosukesuzuki

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• [JSC] Implement `String#search` in C++

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Commits on May 31, 2026

• [JSC] Array rematerialization should preserve double Array holes when having a bad time

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Commits on May 30, 2026

• [JSC] Inline-allocate cells for `NewWeakMap` and `NewWeakSet`

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  sosukesuzuki

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• [JSC] Array rematerialization should know how to have a bad time

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  syg

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  JonWBedard

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• [CMake] Unified-source hygiene fixes for larger bundles

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Commits on May 29, 2026

• [JSC] Move FTL stack overflow check to prologue

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Commits on May 28, 2026

• [JSC] Add NewWeakMap and NewWeakSet DFG nodes

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  sosukesuzuki

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Commits on May 27, 2026

• [JSC] Add ArrayJoin DFG nodes

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Commits on May 26, 2026

• [JSC] Fix GC safety for sunk contiguous array materialization in FTL

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  hyjorc1

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  JonWBedard

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Commits on May 22, 2026

• [JSC] Improve rope-string comparison

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• [JSC] Scan OSR exits' ScratchBuffers

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  syg

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• [Build Speed] Prepare for larger unified build bundles

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  geoffreygaren

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• [JSC] Add DFG node for `String.fromCodePoint`

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Commits on May 20, 2026

• [JSC] Add new `DateNow` DFG node

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  sosukesuzuki

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Commits on May 19, 2026

• [JSC] Implement DFG / FTL ArrayUnshift

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• [JSC] Use scratch buffer for ObjectDefinePropertyFromFields

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• [JSC] Implement ArrayShift DFG node

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Commits on May 18, 2026

• [JSC] Shrink sizeof(JSGenerator)

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• [JSC] Add StringSubstr DFG node

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• [JSC] Inline `String#startsWith` / `String#endsWith` with constant search string in DFG/FTL

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  sosukesuzuki

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• [JSC] Compare 8-bit strings a word at a time in `Array#indexOf` / `Array#includes`

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Commits on May 16, 2026

• [JSC] Implement `String#match` in C++

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  sosukesuzuki

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Commits on May 15, 2026

• [JSC] Extend megamorphic ByVal IC with symbols

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• [JSC] Inline allocation for `Promise.resolve()` of a non-thenable object

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• [JSC] Cache result of Symbol.prototype.toString

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Commits on May 14, 2026

• [JSC] Optimize initial `then` call

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• Use modern integer hash

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• [GLIB] Non-unified build fixes for May 13th 2026

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  csaavedra

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• [JSC] Do not allocate promise reaction when it is initial `then` calls and one handler attachment

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Commits on May 13, 2026

• [JSC] Extract fields of descriptor in Object.defineProperty in DFG / FTL

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Commits on May 12, 2026

• [JSC] Incorrect Math.round Result via floor(x+0.5) JIT Fast Path

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  heimskr

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• [JSC] Mark obvious slow paths as `rarely()` instead of `unsure()` in `FTLLowerDFGToB3`

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  sosukesuzuki

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Commits on May 11, 2026

• [JSC] Fix hole-handling when rematerializing sunk int32 arrays

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