The Plex and feed filter fixtures were typed as the filter type itself, whose scalar filters are
optional: a new optional field compiled without a test value, so its wire key went unchecked.
Both are Required<…> now (a probe field fails typecheck on each). The feed set gained the fields
it omitted (year, librarySource, the scope and show switches) and goes out with and without year,
which wins over the other date filters; a misspelt year key is now red in the wire check, which
passed it before.