fun eventHandler(documents: SWIGTYPE_p_p_Ditto_Document?, document_count: Long, is_initial: Boolean, old_documents: SWIGTYPE_p_p_Ditto_Document?, old_document_count: Long, insertions: SWIGTYPE_p_uintptr_t?, insertion_count: Long, deletions: SWIGTYPE_p_uintptr_t?, deletion_count: Long, updates: SWIGTYPE_p_uintptr_t?, update_count: Long, moves: SWIGTYPE_p_uintptr_t?, move_count: Long): Unit