as per wiki on createhashmapobject:
"#base": Array or HashMap - declaration of base class for inheritance
Array works fine. Hashmap causes out of memory error and CTD. Tested on current stable, profile, and dev branch just in case. No beuno on all of em.
Tested all combinations hashmap in hashmap, hashmap in array, etc.. to see if there was any nuances to it but it would seem any time and any situation a hashmap is set in #base it crashes