-spec decode(OldEntry, Input) -> {ok, ControlMessage, MaybePayload, NewEntry, Rest} | {cont, NewEntry}
          when
              OldEntry :: vdist_entry:t(),
              Input :: binary(),
              ControlMessage :: vdist:dop_t(),
              MaybePayload :: vterm:t() | undefined,
              NewEntry :: vdist_entry:t(),
              Rest :: binary().