Merge "pdl: refactor “isinstance(…) or isinstance(…)”"

            self.parse_typedef_field_(field)

        # Payload and body fields.

        elif (isinstance(field, ast.PayloadField) or isinstance(field, ast.BodyField)):

        elif isinstance(field, (ast.PayloadField, ast.BodyField)):

            self.parse_payload_field_(field)

        # Checksum fields.

def convert_(obj: object) -> object:

    if obj is None:

        return None

    if isinstance(obj, int) or isinstance(obj, str):

    if isinstance(obj, (int, str)):

        return obj

    if isinstance(obj, list):

        return [convert_(elt) for elt in obj]