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Treats leading characters from str as a string of hexadecimal digits (with an optional sign and an optional 0x) and returns the corresponding number. Zero is returned on error.
"0x0a".hex     #=> 10
"-1234".hex    #=> -4660
"0".hex        #=> 0
"wombat".hex   #=> 0
               static VALUE
rb_str_hex(VALUE str)
    return rb_str_to_inum(str, 16, FALSE);

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