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  1. or download this
    perl -wE"$s=pack 'U*', 257; say length $s; print for unpack 'C*', $s;"
1
257
  2. or download this
    >perl -Mbytes -wE"$s=pack 'U*', 257; say length $s; say for unpack 'C*
+', $s;"
2
196
129