      def update(database, collection, selector, change, options = {})
        with_node do |node|
          if safe?
            node.pipeline do
              node.update(database, collection, selector, change, options)
              node.command("admin", { getlasterror: 1 }.merge(safety))
            end
          else
            node.update(database, collection, selector, change, options)
          end
        end
      end
The product receives input or data, but it does
        not validate or incorrectly validates that the input has the
        properties that are required to process the data safely and
        correctly.