From type/Rational

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method base-repeating(Rational:D: Int:D() $base = 10)

Returns a list of two strings that, when concatenated, represent the number in base $base. The second element is the one that repeats. For example:

my ($non-rep, $repeating) = (19/3).base-repeating(10);
say $non-rep;                               # OUTPUT: «6.␤» 
say $repeating;                             # OUTPUT: «3␤» 
printf '%s(%s)', $non-rep, $repeating;      # OUTPUT: «6.(3)»

19/3 is 6.333333... with the 3 repeating indefinitely.

If no repetition occurs, the second string is empty:

say (5/2).base-repeating(10).raku;          # OUTPUT: «("2.5", "")␤»

The precision for determining the repeating group is limited to 1000 characters, above that, the second string is ???.

$base defaults to 10.