def delete(uid)
      @modified_entries.delete(uid)

      index = uid % @size
      if (object = @unmodified_entries[index]) && object.uid == uid
        @unmodified_entries[index] = nil
      end
    end
def delete(uid)
      @modified_entries.delete(uid)

      index = uid % @size
      if (object = @unmodified_entries[index]) && object.uid == uid
        @unmodified_entries[index] = nil
      end
    end
Remove a object from the cache.
 @param uid [Integer] unique ID of object to remove.