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> When io.Copy copies from a TCPConn to a UnixConn, it will now use Linux's splice(2) system call if possible, using the new method TCPConn.WriteTo.

Interface upgrades, yet again, transparently giving us more zero-copy IO. Love how much mileage they’re able to get out of this pattern in the io package.

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Go standard library is absolutely littered with these kinds of tweaks. Not necessarily bad, but it does make an integration with non-standard library less satisfactory because such special casing is not scalable. Still within the expectation though.

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