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intl.d.ts: cleanup, add missing features, fix library discrepancies

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Recent work on the Intl library definitions revealed a lot of outstanding inaccuracies and inconsistencies, and so I've taken a deep dive through ECMA-402 and done some significant housekeeping. This...

lib.d.ts: add missing TypedArray-from-iterable signatures

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Resolves #45198 Resolves #45199 There are stale PRs linked to these issues, but those involved wider remodelling of the array library. This should be simple enough to merge independently.

types(Client): `EventEmitter` static method overrides

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**Please describe the changes this PR makes and why it should be merged:** Fixes a build failure in TypeScript 5.5. Resolves #10358. See discussion at the associated issue. Currently, the...

refactor(collection): `!` overrides for unchecked iterator access

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**Please describe the changes this PR makes and why it should be merged:** Currently, for backward compatibility reasons, when manually traversing builtin iterators, the type of `Iterator.next().value` resolves to `T...

coreutils: add required TS intl libraries

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## References Resolves #16283. ## Code changes Explicitly adds the es2020.intl library, required for RelativeTimeFormat and its ancillary types, to tsconfigbase. Also pre-emptively adds es2021.intl to the coreutils tsconfig, which...

The current implementation of intlFormat currently supports three different call signatures for providing options: calling with format options, calling with locale options, or calling with both as separate arguments. When...

fix(collection)!: default sort comparison algorithm

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**Please describe the changes this PR makes and why it should be merged:** The documentation for `Collection#sort` and `Collection#toSorted` implies that if no comparison function is passed to the method,...

[node] Correct context type in test hook functions

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The various hook functions in node:test (`before()` etc.) are currently typed on the assumption that the context object passed to the hook callback will always be a `SuiteContext`. In fact:...

child_process: validate options.shell and correctly enforce shell invocation in exec/execSync

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The intention of exec and execSync is that a shell is always invoked to run the provided command, as opposed to execFile, which by default executes the target directly and...

perf(collection): optimisations

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#### `.first()`, `.firstKey()` The callback variant of `Array.from()` is slow in V8. Changing the method of array generation from: ```js Array.from({ length: amount }, () => ...) ``` to ```js...