OBJECT_PATH type implementation missing

[Owen Fraser-Green]

> functions (or both) to check for validity? As far as I can see there is

not

> validation checking on the other types (for example that the string part
> of CUSTOM has max length 256, or that a string is valid UTF-8 even
> though there is a function for testing this).
> 
> All I could find in the TODO lists was a statement to the effect that
> the OBJECT_PATH array functions should be implemented one day.
> 
> Cheers,
> Owen

:)