mps_addr_object has no design

[thejayps]

mps_addr_object violates rule.code.design

[thejayps]

raised in #223

[thejayps]

unlike #247, the design for mps_addr_object is assigned essential because, there are subtleties that stem from the design of this feature that affect its usage in ways which may not be obvious. The design needs to be written up and user documentation must then be checked to ensure limitations are clearly documented.