In FreeBSD 12.1 backspace in terminal only deletes one byte of multi-byte character.
For example:
# cat > /tmp/test
tы<backspace>t
# cat /tmp/test
t�t
# hexdump -C /tmp/test
74 d1 74 0a
Where 'ы' is a Russian letter (D18B in hexadecimal form). You may see that only second byte of multi-byte...
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