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The `hexdec()` function decodes the given hexadecimal digit string into
a byte string, optionally skipping specified characters.
Returns null if the input string contains invalid characters or an uneven
amount of hex digits.
Returns the decoded byte string on success.
-- Testcase --
{%
printf("%.J\n", [
hexdec("44 55 66 77 33 44\n"), // whitespace is skipped by default
hexdec("44-55-66:77-33-44", ":-"), // skip specified characters
hexdec("abc"), // error; uneven amount of digits
hexdec("ab cd !"), // error; non-whitespace, non-hex, non-skipped char
hexdec(1234), // error; non-string input
]);
%}
-- End --
-- Expect stdout --
[
"DUfw3D",
"DUfw3D",
null,
null,
null
]
-- End --
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