From docs.perl6.org/type/Rat (anons can't post full urls):
To prevent the numerator and denominator from becoming pathologically large, the denominator is limited to 64 bit storage. On overflow of the denominator a Num (floating-point number) is returned instead.
However, Rat values generated from decimal notation can violate the 64-bit limit.

You can use $x.WHAT to find $x's type if you get tired of guessing based on the number of decimal places displayed.

In reply to Re^6: Small Perl 6 discoveries II, Rats by Anonymous Monk
in thread [Perl6] Small discoveries I, __DATA__ by holli

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