def METHOD_NAME(editable_fields: Dict[str, bool]) -> Set[str]:
    """
    Helper function that returns only the keys marked as True.
    Args:
        editable_fields (Dict[str, bool]): A mapping of strings to a bool value
            that indicates whether they should be in the output set
    Returns:
        Set[str] a set of fields that have a true value.
    """
    return {field for field, is_editable in editable_fields.items() if is_editable}