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Same as 5th draft for the tests, but implementing draft-12 and PR #1389. PR 1389 changes the format of the long header. In particular, the Length field now covers Packet Number in addition to Payload.

There is a new "migration" test, which isn't terribly well defined at the moment. The idea is that if the peer sent a NEW_CONNECTION_ID frame, the local endpoint would start using that new CID for the connection, and verifies that that worked.