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  1. or download this
    ~$ locale
    < ... all set to hu_HU.UTF-8 ... >
    ...
    
    [004] ~$ perl -e 'use Gtk2 -init; printf(q{%f}, 123.456);'
    123,456000
    
  2. or download this
    [005] ~$ perl -e 'use Gtk2 -init; print unpack("H*", 123.789) . "\n";'
    3132332c373839
    ...
    
    [009] ~$ perl -e 'use Gtk2 -init; print unpack("H*", 123.789 . "") . "
    +\n";'
    3132332c373839