  -h, --help               Print help and exit
  -V, --version            Print version and exit
  -s, --stringprep         Prepare string according to nameprep profile
  -d, --punycode-decode    Decode Punycode
  -e, --punycode-encode    Encode Punycode
  -a, --idna-to-ascii      Convert to ACE according to IDNA (default mode)
  -u, --idna-to-unicode    Convert from ACE according to IDNA
      --allow-unassigned   Toggle IDNA AllowUnassigned flag (default off)
      --usestd3asciirules  Toggle IDNA UseSTD3ASCIIRules flag (default off)
      --no-tld             Don't check string for TLD specific rules
  -n, --nfkc               Normalize string according to Unicode v3.2 NFKC
  -p, --profile=STRING     Use specified stringprep profile instead
      --debug              Print debugging information
      --quiet              Silent operation
