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Malte UblandClaude Opus 5.5
d968975f34
An object literal that spreads an index-signature record but has
members outside the scalar join (an array of labels), an unknown-valued
spread (Record<string, unknown>), or a member a later spread may
overwrite with another type now maps to the checked-dynamic value: it is
built like a JavaScript object literal, so spreads copy their own keys
in order and later keyed writes land on the same object.
'c && { k: v }' spreads contribute k exactly when c is truthy even where
the checker's union of the two does not map (an AbortSignal member), and
a conditional spread onto an 'unknown' field leaves the checked-dynamic
undefined in its empty arm.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>