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  DB<1> $x = 319.02 - 112.09 - 69.75 - 113.57 - 23.61;

  DB<2> p $x
-1.4210854715202e-14

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> my $x = 319.02 - 112.09 - 69.75 - 113.57 - 23.61;
0
...
0.00000000000000000000000000000000000000000000000000
> say $x == 0;
True