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  1. or download this
    Perl> use Devel::Peek;;
Perl> $n = 9_999_999_998; print Dump( $n ); print $n & 1; print Dump( 
+$n );;
...
  UV = 4294967295
  NV = 9999999998
  PV = 0
  2. or download this
    Perl> $c++ for 1 .. 2**32;;
[Range iterator outside integer range at (eval 7) line 1, <STDIN> line
+ 3.