FormBody.getAll(name: string): readonly FormValue[]
Returns every value for a name in wire order — the web standard's
getAll, so a repeated field (multi-select, multi-file) keeps the order
the client sent.
The returned array is the parse's own READ view, not a defensive copy:
mutating it mutates what later getAll calls return. Treat it as
read-only (the IResponse.snapshot() precedent — a copy would allocate
on every read of a value most readers never touch).
readonly FormValue[]
The values, empty when the name is absent