docs: def to_python(self, value):
          """
          B64decode and unpickle the object, optionally decompressing it.
  
          If an error is raised in de-pickling and we're sure the value is
          a definite pickle, the error is allowed to propogate. If we
          aren't sure if the value is a pickle or not, then we catch the
          error and return the original value instead.
  
          """
          if value is not None:
              try:
                  value = dbsafe_decode(value, self.compress)
              except:
                  # If the value is a definite pickle; and an error is raised in
                  # de-pickling it should be allowed to propogate.
                  if isinstance(value, PickledObject):
                      raise
          return value