- timeZoneError and browserTimeZone switch over TimeZoneRejection instead of
a ternary: each reason that shares a diagnostic is its own case, and the
default arm assigns the reason to never so adding a reason fails the build
(assertNever where the package already imports it). The unsupported cause
is still forwarded.
- the request-zone suite now exercises the blank refusal, so every case the
switch lists is covered rather than sharing one ternary branch.
- Duration documents that a span is signed: a negative count builds and
decompose() refuses it, so the caller states its own sign policy.
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