Original text:
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in BCP <del> 14 RFC2119 RFC8174 when, and only when, they appear in all capitals, as shown here. </del>  This document defines requirements on future QUIC versions, even where normative language is not used. The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in BCP <del> 14 RFC2119 RFC8174 when, and only when, they appear in all capitals, as shown here. </del>  Commonly used terms in this document are described below. current maximum datagram size, referred to as PMTU probes.  All QUIC packets that are not sent in a PMTU probe SHOULD be sized to fit within the maximum datagram size to avoid the datagram being <del> fragmented or dropped RFC8085. </del>  If a QUIC endpoint determines that the PMTU between any pair of local and remote IP addresses cannot support the smallest allowed maximum the payload of an ICMP message to associate the message with a corresponding transport connection (see Section 4.6.1 of DPLPMTUD). ICMP message validation MUST include matching IP addresses and UDP <del> ports RFC8085 and, when possible, connection IDs to an active QUIC </del>  session.  The endpoint SHOULD ignore all ICMP messages that fail validation. The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in BCP <del> 14 RFC2119 RFC8174 when, and only when, they appear in all capitals, as shown here. </del>  This document uses the terminology established in QUIC-TRANSPORT. The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in BCP <del> 14 RFC2119 RFC8174 when, and only when, they appear in all capitals, as shown here. </del>  This document uses the variable-length integer encoding from QUIC- TRANSPORT. The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in BCP <del> 14 RFC2119 RFC8174 when, and only when, they appear in all capitals, as shown here. </del>  Definitions of terms that are used in this document:

Reviewer comments:
This includes all the updates to references in transport. This includes new code again. See URL It would be possible to cite BCP38 as an RFC and avoid this, but I think that the BCP reference is correct. Not as sure about the BCP145 reference, as we need to point to the RFC directly to get the section reference, but I think that is OK on balance.

Revised text:
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in BCP  <ins> 14 BCP14 when, and only when, they appear in all capitals, as shown here. </ins> This document defines requirements on future QUIC versions, even where normative language is not used. The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in BCP  <ins> 14 BCP14 when, and only when, they appear in all capitals, as shown here. </ins> Commonly used terms in this document are described below. current maximum datagram size, referred to as PMTU probes.  All QUIC packets that are not sent in a PMTU probe SHOULD be sized to fit within the maximum datagram size to avoid the datagram being  <ins> fragmented or dropped BCP145. </ins> If a QUIC endpoint determines that the PMTU between any pair of local and remote IP addresses cannot support the smallest allowed maximum the payload of an ICMP message to associate the message with a corresponding transport connection (see Section 4.6.1 of DPLPMTUD). ICMP message validation MUST include matching IP addresses and UDP  <ins> ports BCP145 and, when possible, connection IDs to an active QUIC </ins> session.  The endpoint SHOULD ignore all ICMP messages that fail validation. The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in BCP  <ins> 14 BCP14 when, and only when, they appear in all capitals, as shown here. </ins> This document uses the terminology established in QUIC-TRANSPORT. The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in BCP  <ins> 14 BCP14 when, and only when, they appear in all capitals, as shown here. </ins> This document uses the variable-length integer encoding from QUIC- TRANSPORT. The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in BCP  <ins> 14 BCP14 when, and only when, they appear in all capitals, as shown here. </ins> Definitions of terms that are used in this document: