code: def levelise(level):
      '''
      Describe which levels are allowed to do deep merging.
  
      level can be:
  
      True
          all levels are True
  
      False
          all levels are False
  
      an int
          only the first levels are True, the others are False
  
      a sequence
          it describes which levels are True, it can be:
  
          * a list of bool and int values
          * a string of 0 and 1 characters
  
      '''
  
      if not level:  # False, 0, [] ...
          return False, False
      if level is True:
          return True, True
      if isinstance(level, int):
          return True, level - 1
      try:  # a sequence
          deep, subs = int(level[0]), level[1:]
          return bool(deep), subs
      except Exception as error:
          log.warning(error)
          raisf levelise(level):
      '''
      Describe which levels are allowed to do deep merging.
  
      level can be:
  
      True
          all levels are True
  
      False
          all levels are False
  
      an int
          only the first levels are True, the others are False
  
      a sequence
          it describes which levels are True, it can be:
  
          * a list of bool and int values
          * a string of 0 and 1 characters
  
      '''
  
      if not level:  # False, 0, [] ...
          return False, False
      if level is True:
          return True, True
      if isinstance(level, int):
          return True, level - 1
      try:  # a sequence
          deep, subs = int(level[0]), level[1:]
          return bool(deep), subs
      except Exception as error:
          log.warning(error)
          raise
docs: Describe which levels are allowed to do deep merging.
  
      level can be:
  
      True
          all levels are True
  
      False
          all levels are False
  
      an int
          only the first levels are True, the others are False
  
      a sequence
          it describes which levels are True, it can be:
  
          * a list of bool and int values
          * a string of 0 and 1 characters