SCTP did both reliable/unreliable and ordered/unordered, with QUIC arguably being at least a bit inspired by it, but going over UDP because internet is broken.

SCTP did both reliable/unreliable and ordered/unordered, with QUIC arguably being at least a bit inspired by it, but going over UDP because internet is broken. EDIT: Internet being broken is also why there's a grease extension for QUIC