net/http can't access PP2_TYPE_ALPN which is necessary for the HTTP/2 upgrade.

Some manual logic is necessary to handle HTTP/2 upgrades, e.g. https://git.sr.ht/~emersion/kimchi/tree/master/item/server.go#L175

Would it be desirable to host this glue code in go-proxyproto so that users can easily fire up an HTTP server with HTTP/2 upgrade support?