I think one should use arrays only exactly in the manner they were declared (except for one-dimensional access two-dimensional arrays which is specifically supported). Everything else is eliciting undefined behaviour, the specifics of which are apt to change without notice from one Fox release or service pack to the next.

In my opinion it is rather unfortunate that one-dim arrays cannot be treated like two-dim arrays with one column, because that makes it necessary to special-case one-dims in all general array handling code or simply ban their use altogether.