I created a TCP Proxy using io.copy (which creates a splice). Here is the 
code.

Proxy TCP Server - https://pastebin.com/iAcFjmV1
Regular TCP Server - https://pastebin.com/V6AN7atV

When using telent to port 8080, the proxy starts and everything typed in 
the telnet will be returned. After 10 seconds, the connection drop to the 
proxy but you can see there is one message/packet lost.

Proxy Logs - https://prnt.sc/u76C3KyeXAI3
Telnet Logs - https://prnt.sc/VK9vbmishxi2

You can see that the proxy ends at the end of when 0 is used in Telnet. 's' 
is then sent from the Telnet but it's not seen in the proxy.go as shown in 
the screenshot. 'd' 'f' etc are then seen in the proxy.go.

's' is lost. Is this a bug?

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