call to __Value methods can't pass fields as arguments

[Roland Westrelin]

> Let’s go with T_OBJECT right now (with a comment please).
>
> Could the calling convention be revisited later?
>   1 - to have T_VALUETYPE being a real reference to a standalone
>        value (and then could be used in the case we are discussing)
>   2 - to add a special delimiter type instead of overloading T_VALUETYPE

Yes. I'll think about it.

Roland.