1: The "-n" switch.
echo "This.com" | idn -n
invalid option -- n
echo "This.com" | idn --nfkc
This.com
2: Case folding
echo "This.com" | idn --nfkc
This.com
echo "This.com" | idn -s
this.com
but
echo "This.com" | idn -a
This.com
Shouldn't the last be lower-cased?
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