[quicwg/base-drafts] Exception for Retire Prior To (#3643)

[Martin Thomson <[e-mail]>]

The rules for the active connection ID limit were such that the brief
bump that NEW_CONNECTION_ID + Retire Prior To could add was not
permitted.  Strictly speaking, if you requested retirement, the
connection IDs that you requested be retired are still active until you
receive a RETIRE_CONNECTION_ID frame.  That means that you were
technically violating this MUST in the spec.  Adding an exception for
this case was the best way I could see to fix this.

The other was to change the definition of "active connection ID".  I
tried that and, while it was a smaller change, it made the definition
less crisp.  This approach seems best.

(This is not new normative requirements as this is already [in the spec](https://quicwg.org/base-drafts/draft-ietf-quic-transport.html#section-5.1.2-5).)
You can view, comment on, or merge this pull request online at:

  https://github.com/quicwg/base-drafts/pull/3643

-- Commit Summary --

  * Exception for Retire Prior To

-- File Changes --

    M draft-ietf-quic-transport.md (9)

-- Patch Links --

https://github.com/quicwg/base-drafts/pull/3643.patch
https://github.com/quicwg/base-drafts/pull/3643.diff

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