Malte UblandClaude Opus 5.5 e198a9eec2 Dispatch a keyof read whose member is unknown per declared key ...

`settings[key]` over a settings record with an `unknown` member
(`type: unknown`) refuses even though every field reads through a
checked-dynamic slot: the checker's answer collapses to `unknown`
because the union of the field types absorbs into it, so there is no
typed join for the keyed read to dispatch into.

Recognize that shape — the read's type is `unknown`, the shape has no
index signature, and every declared field's value is checked-dynamic
representable — and dispatch per declared key answering a checked-
dynamic read. The key type is the record's own `keyof`, so the answer
is always present.

Corpus 8523 pins the read differentially.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

2026-10-29 05:38:11 -07:00

..

corpus

Dispatch a keyof read whose member is unknown per declared key

2026-10-29 05:38:11 -07:00

corpus-node-islands-order

Treat the zlib ordering program as a timer race

2026-10-28 01:47:01 -05:00

coverage-fixtures

Expect exact canonical mappings in the dynamic-slot coverage tests

2026-10-27 07:42:33 -07:00

deadstrip

…

diagnostics

Store tty.isatty and process.cwd as function values (#2494)

2026-10-28 22:46:19 -05:00

ffi

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fixtures

Route more packages and values through Node islands (NI-4c–4g) (#1904)

2026-10-28 21:53:40 -05:00

harness

Dispatch a keyof read whose member is unknown per declared key

2026-10-29 05:38:11 -07:00

library-mode

Add object literal members through the store caches in untyped code

2026-10-25 08:24:12 -05:00

node-parallel

Undo the main merge on a stacked branch

2026-10-25 05:03:57 -05:00

test262

Undo the main merge on a stacked branch

2026-10-25 05:03:57 -05:00

wasm-spec

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