[sgbeal]

> How do you accurately model real world problemds where nulls happen without this entity?

After having considered JSON, it seems that both null and undefined are necessary in this frame so that consumers of the json can differentiate between "property not set" and "property set to a non-value."

This framework's JSON support is still on the TODO porting list from its predecessor, so that aspect hadn't yet come up in the day-to-day development.