I’m reading the current implementation of io.Copy for TCPConn. It has a struct called tcpConnWithoutWriteTo 3 <https://github.com/golang/go/blob/87ec2c959c73e62bfae230ef7efca11ec2a90804/src/net/net.go#L778>, which will cause the WriterTo casting from a io.Reader to fail 1 <https://github.com/golang/go/blob/e89e880eacb1aceaa14733f44c38e6748d5ffa9c/src/io/io.go#L410>. How and why does it work internally?
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