A selected IONEX product paired with its staleness metadata.
handle is a usable parsed-IONEX reference: for an :exact result it is the
caller's own input handle (so Sidereon.GNSS.Ionosphere.ionex_slant_delay/7
is bit-for-bit identical to using it directly); for a :diurnal_shift result
it is a fresh handle wrapping the whole-day-advanced grid. metadata reports
the degradation kind and staleness.
Summary
Types
@type t() :: %Sidereon.GNSS.Staleness.IonexSelection{ handle: reference(), metadata: Sidereon.GNSS.Staleness.StalenessMetadata.t() }