Linear arrays

I noticed that arrget and arrset seem to be absent from ATS, though there
is an implementation provided at

http://www.ats-lang.org/DOCUMENT/INTPROGINATS/HTML/x3427.html

Just curious if that implementation of arrget is still the preferred way to
go for starting out with linear types and arrays?

Sorry, I noticed the implemented function array_ptr_get_elt_at which has
the same interface (essentially).