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Malte UblandClaude Opus 5.5
85a2567ecd
A record type whose declared members are all optional and typed as its
index signature's slot (ProcessEnv's TZ?, '{ CI?: string } &
Dictionary<string>') interns as the pure index-signature record, its
slot admitting undefined: spread, delete and enumeration then follow one
insertion order. 'value as never' erases, so the consuming slot checks
an unknown value like any other. 'Object.fromEntries(...) as T' for a
declared record T goes through the checked-dynamic bridge, which keeps
the entries' keys and order.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>