Bump Jint from 4.16.2 to 4.16.3

[dependabot]

Updated Jint from 4.16.2 to 4.16.3.

Release notes

Sourced from Jint's releases.

4.16.3

Jint 4.16.3 is a maintenance release from the 4.x branch: correctness and conformance fixes backported from main, and nothing that changes an existing API or an existing default. If you are on 4.16.2 it is a drop-in update — every public signature is the one 4.16.0 shipped, on all five target frameworks, and the per-framework snapshots in Jint.Tests.PublicInterface/Verify/ are unchanged. main remains 5.0.0 development; what is coming there is recorded as it lands in docs/v5-migration.md.

Highlights

A long-lived engine stops accumulating what it has already run. Evaluate(string) and Execute(string) parse a fresh Script on every call, and the engine kept every one of them. Three of the four per-engine handler-tree caches already reset wholesale at 2048 entries so a host streaming endless distinct sources cannot grow them without bound; the fourth, _evaluatedScripts, never got that ceiling and held its keys strongly, retaining the AST of every distinct script the engine had ever evaluated — about 528 bytes per call, climbing forever and reclaimed by nothing short of dropping the engine (#​4116). The realm's tagged-template map had the same shape and a harder constraint: Realm._templateMap was a Dictionary<Node, JsArray>, strong on both ends and never cleared, costing roughly 1.35 KB per call for a frozen array and its raw array. A ceiling is no remedy there, because evicting a live template site is script-visible — f() === f() must hold for one site — so it becomes a ConditionalWeakTable<Node, WeakReference<JsArray>>, weak on both halves (#​4119). Both matter most to exactly the embedding that looks innocuous: one engine, kept for the lifetime of the process, handed ad-hoc source.

A suspended frame no longer dereferences what the suspension produced. await and yield suspend by returning a plain undefined, and the enclosing member link turns that into a sentinel reference that every consumer must recognise before reading. Nine did not, so they read undefined.undefined and raised a TypeError inside a frame that was already suspended. AsyncBlockStart swallowed that throw, but not before the statement-list resume position had been cleared on the way out — so the resume replayed the body from the first statement: one extra run of every un-awaited side effect per suspension point, and a re-entrancy guard silently truncating the rest. In a generator nothing swallows it and the TypeError comes straight out of next(). Two shapes were wrong answers rather than repeated ones — (await p).x = 1 rejected the promise, and o[await k] = 1 assigned to the literal key "undefined" instead of the real one — and for await ((await p).a of it) never terminated at all. Optional chaining was not the trigger despite where the report put it: the guarded fast lane needs a literal property name, so every computed member read of an awaited or yielded value fell through, (await p)[0] as much as (await p)[k] (#​4089, reported by @​davidwengier in #​4086).

Verification

Every change was verified failing-first against the unfixed branch. The suspension fix is pinned by 35 new cases in Jint.Tests/Runtime/SuspendedOptionalChainTests.cs: against 4.16.2's code 28 fail and 6 pass on both .NET 10 and .NET Framework 4.7.2, with a 35th — the for await shape — hanging the test host outright rather than failing; after the fix all 35 pass on both. The retention fixes are pinned by Jint.Tests/Runtime/GarbageCollectionTests.cs and TaggedTemplateCacheTests.cs.

Release diagnostics on the tagged commit, in Release: Jint.Tests 7,170 (net10.0) and 7,085 (net472); Jint.Tests.PublicInterface 1,852 and 1,844; Jint.Tests.CommonScripts 28 and 28; Jint.Tests.SourceGenerators 52; the host-contract verification leg (JINT_HOST_CONTRACT_VERIFICATION=1) 7,170 / 7,085 and 1,856 / 1,848 — zero failures anywhere. test262: 102,498 passed, 183 skipped, with three files crossing the engine's default 30-second budget under whole-suite CPU contention and passing in three seconds when run alone.

The paired SunSpider and Dromaeo comparison against 4.16.2 was run after the tag rather than before it, which is a departure from how 4.16.2 was gated; it is recorded here because the result is what the release notes should carry, not the order it arrived in. No row regressed. Fifty-one rows, paired, alternating order, DefaultJob, on an idle machine: the three-round screen left two candidates clearing the sign-agreement and magnitude bar, both of them Dromaeo.StringBase64, and re-measuring those at eight rounds read −1.72% [−3.01, +1.98] and +0.30% [−3.10, +4.26] — no change, with a third parameter combination coming out faster. StringBase64 is the row Jint.Benchmark/AGENTS.md already documents as a three-round false positive, and it behaved as documented. The Cube control rows moved +0.6% to +0.8%, which is this machine's floor on rows the change cannot reach.

Nothing here is a performance change by intent. #​4119 does move a tagged-template lookup from a Dictionary to a ConditionalWeakTable and #​4089 adds suspension checks to several interpreter lanes, and neither is visible above the noise floor.

What's Changed

• Backport #​4115 to 4.x: bound the evaluated-script set by @​lahma in Backport #4115 to 4.x: bound the evaluated-script set sebastienros/jint#4116
• Backport #​4118 to 4.x: stop the realm's template map retaining every site it ran by @​lahma in Backport #4118 to 4.x: stop the realm's template map retaining every site it ran sebastienros/jint#4119
• Async and generators: a suspended frame dereferences nothing the suspension produced (backport of #​4088) by @​lahma in Async and generators: a suspended frame dereferences nothing the suspension produced (backport of #4088) sebastienros/jint#4089

Full Changelog: sebastienros/jint@v4.16.2...v4.16.3

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