# File lib/moneta/adapters/lmdb.rb, line 65
      def increment(key, amount = 1, options = {})
        @backend.transaction do
          value = @db.get(key)
          value = Utils.to_int(value) + amount
          @db.put(key, value.to_s, Utils.only(options, *PUT_FLAGS))
          value
        end
      end