shared compiles with noUncheckedIndexedAccess, so a capture group is
string | undefined there even when the pattern guarantees it. Pull the groups
through optional access with explicit fallbacks instead of indexing into the
match, which also drops the two throwaway locals.
No behaviour change: same inputs, same outputs, the spec is untouched.
splitIso reached the time by taking characters 11..16, so "2026-06-11T01:11 PM"
became 01:11. The hour survived and the half of the day did not, which is why
AM and 24-hour times in the same document imported correctly. The arrival then
sorted before the departure and the router rolled it onto the next day, so a
three-hour hop was rendered as an overnight.
The client has done this properly since #1725; this is the server half, which
was never pulled across. normalizeLocalDateTime rewrites a value only when it
actually finds a meridiem, so a date-only value, a value carrying an offset and
anything the parser does not know come back byte for byte.
The mapper has only two exits for a date, toIsoString and splitIso, so this
covers all eight types and every emitted field at once. It also stops
sameConnection comparing a NaN timestamp, which silently merged unrelated legs
into one booking.
Maurice