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  1. or download this
    > my $x = 1.111111111111111111111.FatRat; my $y = 1.111111111111111111
+111.Rat; $x - $y
0
...
> say $y
1.11111111111111111604544
>
  2. or download this
    C:\>perl -le "printf '%.22e\n', 1.1111111111111111;"
1.1111111111111111604544e+000\n
  3. or download this
    > my $x = 1.111111111111111111111.FatRat; my $y = 1.1111111111111111.N
+um; $x - $y
0
> $x == $y
True