Documentation for method bool-only
Documentation for method bool-only, assembled from the following types:
By default is not implemented, but expected implementation for types that do this role is:
method bool-only(--> Bool)
The method returns
True if there are elements that can be generated by this Iterator by, for example, calling pull-one, and
False otherwise. Important: it's expected the
Iterators that implement this method can produce that answer without exhausting themselves. In other words, it's expected the user of the class will be able to still pull-one after calling this method.