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Treats leading characters of str as a string of octal digits (with an optional sign) and returns the corresponding number. Returns 0 if the conversion fails.
"123".oct       #=> 83
"-377".oct      #=> -255
"bad".oct       #=> 0
"0377bad".oct   #=> 255
If str starts with 0, radix indicators are honored. See Kernel#Integer.
               static VALUE
rb_str_oct(VALUE str)
    return rb_str_to_inum(str, -8, FALSE);

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