docs: def initialize_bitarray(self):
          """Initialize both bitarray.
  
          This BF contain two bit arrays instead of single one like a plain BF. bitarray
          is the main bit array where all the historical items are stored. It's the one
          used for the membership query. The second one, current_day_bitarray is the one
          used for creating the daily snapshot.
          """
          self.bitarray = bitarray.bitarray(self.nbr_bits)
          self.current_day_bitarray = bitarray.bitarray(self.nbr_bits)
          self.bitarray.setall(False)
          self.current_day_bitarray.setall(False)