I'm on completely unknown (to me) ground here now, but do xterm's retain the old-fashioned serial port configuration parameters?
What I'm getting at is that it used to be possible to configure terminals for 7-bit or 8-bit; odd/even/no parity etc.
If you sent unicode to a terminal that was configured to expect 7-bit input, it might strip the 8th bit. And byte value \220 (decimal 144) suddenly becomes ascii 16 which is right in amongst the device control characters often used for X-on/X-off and similar. (It's not one of those two, but who knows what others there were back in the day?)
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