Documentation for method bool-only assembled from the following pages:
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)