Documentation for method bool-only assembled from the following types:

role PredictiveIterator

From PredictiveIterator

(PredictiveIterator) method bool-only

Defaults to the Booleanification of the result of calling the count-only method. If it is possible to have a faster way of finding out whether the iterator is capable of producing any value, it should be implemented.

Defined as:

method bool-only(--> Bool:D) { self.count-only.Bool }