pipe chunking vs Windows

I have just discovered that the recently implemented pipe chunking 
protocol is broken on Windows. This is because the pipes are operating 
in text mode and doing LF->CR-LF translation, so the number of bytes 
received is not the number transmitted and set in the protocol header.

I have not yet succeeded in turning this behaviour off (_setmode() 
didn't seem to affect it). If we can't find a way to turn it off, the 
only solution short of abandoning its use on Windows that I can think of 
is to translate LF on input to something unlikely like 0x1C and then 
translate it back when we read it from the pipe.

cheers

andrew