- Will allow IETF quic-go and legacy gQUIC quic-go
to coexist.
- Vendor copy of quic-go gquic branch ended up
with many local patches.
- Upstream quic-go gquic is no longer supported,
and significant further changes are not expected.
// This stopWaitingManager is not supposed to satisfy the StopWaitingManager interface, which is a remnant of the legacy AckHandler, and should be remove once we drop support for QUIC 33