Unit tests fail when Perl uses 32-bit integers

[cubranic]

Running t/io-parser.t on a 32-bit Ubuntu box, or in this CPAN Testers report:

Argument must be a number 0-4294967295: 305419896 at lib/Statistics/R/IO/Parser.pm line 145.
   # Child (int parsers) exited without calling finalize()

#   Failed test 'int parsers'

[cubranic]

Parser.pm:145 is the argument validity check in uint32:

die 'Argument must be a number 0-4294967295: ' . $arg
    unless looks_like_number($arg) && $arg < 1<<32 && $arg >= 0;