multistream-select

Don't wait for negotiation on <Negotiated as AsyncWrite>::poll_close. This can save one round-trip for protocols that use stream closing as an operation in ones protocol, e.g. using stream closing to signal the end of a request. See PR 4019 for details.

Raise MSRV to 1.65. See PR 3715.

Make the V1Lazy upgrade strategy more interoperable with V1. Specifically, the listener now behaves identically with V1 and V1Lazy. Furthermore, the multistream-select protocol header is now also identical, making V1 and V1Lazy indistinguishable on the wire. The remaining central effect of V1Lazy is that the dialer, if it only supports a single protocol in a negotiation, optimistically settles on that protocol without immediately flushing the negotiation data (i.e. protocol proposal) and without waiting for the corresponding confirmation before it is able to start sending application data, expecting the used protocol to be confirmed with the response.

Fix the encoding and decoding of ls responses to be spec-compliant and interoperable with other implementations. For a clean upgrade, 0.8.4 must already be deployed.

Fix a regression resulting in a panic with the V1Lazy protocol. PR 1783.

Fix a potential deadlock during protocol negotiation due to a missing flush, potentially resulting in sporadic protocol upgrade timeouts. PR 1781.

Update dependencies.