Agreed. Fail fast is now the more desirable outcome, particularly for consumer messaging. Moreover it is just inside the boundary of the RFC. The standard does

Agreed. Fail fast is now the more desirable outcome, particularly for consumer messaging. Moreover it is just inside the boundary of the RFC. The standard does not explicitly reject a zero number of retries, nor does it insist on the failure window; the language is noncommittal, and for an RFC that is significant and can only be interpreted as intentional.