Reverso for the QUIC protocol

This document describes a QUIC version re-designing the layout of the QUIC protocol to avoid memory fragmentation at the receiver and allows implementers seeking a more efficient implementation to have the option to implement contiguous zero-copy at the receiver. This document describes the change from QUIC v1 required in packet formats, variable-length integers and frame formats. Everything else from QUIC v1 described in [RFC9000] is untouched.