Type Definition tetsy_multistream_select::
type DialerSelectFuture<R, I> = Either<DialerSelectSeq<R, I>, DialerSelectPar<R, I>>;
Future, returned by
dialer_select_proto, which selects a protocol and dialer
either trying protocols in-order, or by requesting all protocols supported
by the remote upfront, from which the first protocol found in the dialer’s
list of protocols is selected.