docs: def validate_options(self, k, v):
          """Validate options."""
  
          super().validate_options(k, v)
          if k == 'delimiters':
              for d in v:
                  if not isinstance(d, (dict, OrderedDict)):
                      raise ValueError("{}: 'delimters' entries must be of dict type.".format(self.__class__.__name__))
                  for key, value in d.items():
                      if key not in ('open', 'close', 'content'):
                          raise KeyError(
                              "{}: '{}' is not a valid key for a 'delimeters' entry.".format(self.__class__.__name__, key)
                          )
                      if not isinstance(value, str):
                          raise ValueError(
                              "{}: 'delimeters' '{}' key should have str values.".format(self.__class__.__name__, value)
                          )