Binary number > 0b11111111111111111111111111111111 non-
       portable
           (W portable) The binary number you specified is larger
           than 2**32-1 (4294967295) and therefore non-portable
           between systems.  See perlport for more on portability
           concerns.

       Illegal binary digit %s ignored
           (W digit) You may have tried to use a digit other than
           0 or 1 in a binary number.  Interpretation of the
           binary number stopped before the offending digit.

       Integer overflow in %s number
           (W overflow) The hexadecimal, octal or binary number
           you have specified either as a literal or as an argu-
           ment to hex() or oct() is too big for your architec-
           ture, and has been converted to a floating point num-
           ber.  On a 32-bit architecture the largest hexadeci-
           mal, octal or binary number representable without
           overflow is 0xFFFFFFFF, 037777777777, or
           0b11111111111111111111111111111111 respectively.  Note
           that Perl transparently promotes all numbers to a
           floating point representation internally--subject to
           loss of precision errors in subsequent operations.

                    -- perldiag

SYNOPSIS
           $n = 1234;              # decimal integer
           $n = 0b1110011;         # binary integer
           $n = 01234;             # octal integer
           $n = 0x1234;            # hexadecimal integer
           $n = 12.34e-56;         # exponential notation
           $n = "-12.34e56";       # number specified as a string
           $n = "1234";            # number specified as a string

                    -- perlnumber

       grok_bin
               converts a string representing a binary number to
               numeric form.


               The hex number may optionally be prefixed with
               "0b" or "b" unless "PERL_SCAN_DISALLOW_PREFIX" is
               set in *flags on entry. If "PERL_SCAN_ALLOW_UNDER-
               SCORES" is set in *flags then the binary number
               may use '_' characters to separate digits.


                    -- perlapi