Return true if the specified index is currently in use, and false otherwise. The behavior is undefined unless 0 <= index and index < nextNewIndex(). Note that this method runs in time proportional to the number of decommissioned indices.
Return true if the specified index is currently in use, and false otherwise. The behavior is undefined unless 0 <= index and index < nextNewIndex(). Note that this method runs in time proportional to the number of decommissioned indices.