query<C extends E> abstract method
Allow you to find a subset of this set with all the elements e for
which the condition e is C is true. This is equivalent to
orderedSet.whereType<C>()
except that it is O(0).
Note: you must call register for every type C you desire to use
before calling this, or set strictMode to false.
Implementation
Iterable<C> query<C extends E>();