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Malte UblandClaude Opus 5.5
61ab4fbc25
`{ ...maybeRecord }` where the source is `T | undefined` was an SC1090
refusal when the target field had no earlier contributor. Node treats an
absent source as a no-op, so a present source now copies field by field
through the checked extraction (`x!`): the record arm copies the value,
and the absent unit arm throws the catchable TypeError instead of leaving
a required slot unset. An optional target field keeps its no-copy arm.
Corpus 8501 pins the present-source copy and the optional destination; a
new errors-harness case covers both arms of the required-field path.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>