old_contents: import math
  
  
  class Property:
      """
      Base class for all properties.
  
      """
  
  
  class IntegerProperty(Property):
  
      def __init__(self, max_val):
          self.max_val = max_val
          self.bit_width = int(math.log2(max_val)) + 1
  
new_contents: import math
  
  
  class Property:
      """
      Base class for all properties.
  
      """
  
  
  class IntegerProperty(Property):
  
      def __init__(self, max_val):
          self.max_val = max_val
          self.bit_width = int(math.log2(max_val)) + 1
  
  
  class ContainerProperty(Property):
      pass
  
subject: Add placeholder for ContainerProperty