Answer a new instance of an ArrayedCollection containing all the elements in the receiver, followed by all the elements in aSequenceableCollection
This method should not be called for instances of this class.
Answer a collection of the same kind returned by #collect:, that only includes the values at the given indices. Fail if any of the values in keyCollection is out of bounds for the receiver.
Answer a new collection containing all the items in the receiver from the start-th and to the stop-th
Answer a new instance of an ArrayedCollection containing all the elements in the receiver, followed by the single item anElement
Answer a copy of the receiver to which all occurrences of oldElement are removed