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implement an early data API #110
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This API is not very sophisticated, in particular, it doesn't implement the proposal discussed in libp2p/go-libp2p#1537. It only implements the bare minimum we need for the WebTransport handshake (see libp2p/specs#404 (comment) for details).
The client can send (unencrypted, but integrity-protected) data along the first handshake message, and the server can read that data and decide if it wants to abort the handshake.