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  1. or download this
    > my Rational $x = 1.111111111111111111111;
1.11111111111111111604544
> $x *= 0.1;
Type check failed in assignment to $x; expected Rational but got Num (
+0.111111111111111e0)
  2. or download this
    > sub foo(FatRat() $x) { return $x }; foo(pi).nude
(355 113)
> pi.FatRat(1e-8).nude
(103993 33102)
  3. or download this
    > my FatRat() $x = 0.1;
===SORRY!=== Error while compiling:
...
------> my FatRat() $x⏏ = 0.1;
    expecting any of:
        constraint