* Regression tests for telling a refused PDU from a failed session
* Export PduRefusedError so a refusal can be told from a session failure
* Document telling a refused PDU from a session failure
* Share the malformed-PDU fixtures and pin that a dead stream is no refusal
* Say once what a refusal is, and why the header type is published
* Fold the refused-response test into the one that already staged it
* Drop the refusal-rate claim the interop finding does not support
* Build a raw PDU one way, sequence number included
* Follow PduRefusedError into pdu-refusal.ts
