Just read the already existing posts, even mine.
In v6 it happened by mistake, in v7 this error has been fixed.
What happens in v7 is the right behavior.
There are no “pointers” in RouterOS as understood in some programming languages.
Is present “op”, one operational pointer that work as shortcut for complex array:
http://forum.mikrotik.com/t/persistent-environment-variables/145326/6
All data types on RouterOS:
http://forum.mikrotik.com/t/structured-ipv6-address/168153/7