def axis_conversion_ensure(operator: 'bpy.types.Operator', forward_attr:
    str, up_attr: str) ->bool:
    """Function to ensure an operator has valid axis conversion settings, intended to be used from bpy.types.Operator.check. 

    :param operator: the operator to access axis attributes from. 
    :type operator: 'bpy.types.Operator'
    :param forward_attr: attribute storing the forward axis 
    :type forward_attr: str
    :param up_attr: attribute storing the up axis 
    :type up_attr: str
    :return:  True if the value was modified. 
    """
    pass
