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# "pack" in an untyped language.
my $packed = pack('c N c/a*', $c, $i, $s);

# "unpack" in an untyped language.
my ($c, $i, $s) = unpack('c N c/a*', $packed);

# "pack" in an typed language.
Array<Object> unpacked;
...
char   c = unpacked[0];
int    i = unpacked[1];
String s = unpacked[2];

# "pack" in a typed language.

...
}

unpack_my_format(packed, char c, int i, String s);