No not the magical kind.

hex.gml

function hex(str) {
    var result = 0;
    
    // special unicode values
    static ZERO = ord("0");
    static NINE = ord("9");
    static A = ord("A");
    static F = ord("F");
    
    for (var i = 1; i <= string_length(str); i++) {
        var c = ord(string_char_at(string_upper(str), i));
        // you could also multiply by 16 but you get more nerd points for bitshifts
        result = result << 4;
        // if the character is a number or letter, add the value
        // it represents to the total
        if (c >= ZERO && c <= NINE) {
            result = result + (c - ZERO);
        } else if (c >= A && c <= F) {
            result = result + (c - A + 10);
        // otherwise complain
        } else {
            throw "bad input for hex(str): " + str;
        }
    }
    
    return result;
}