Add AdditionalProperties: false to all OCF Types that are JSONSchema Objects?

[JSv4]

I noticed we took a consistent approach of not including the additionalProperties: false property on our type schemas. I don't recall this being a distinction we discussed. Given our earlier discussion on this point and the decision to lock the properties on OCF objects, I think we should lock OCF types that are JSONSchema "object" types too? If we don't you can add properties on a type, just checked.

I also checked the behavior of enums and scalar JSONSchema types, and I don't think it's necessary to add additionalProperties to those as they already don't let you "add" additional properties. E.g. you can't add options to the enum, and, if we're defining a regex string field, for example, only strings that match that regex pattern are accepted, regardless of the presence of an additionalProperties flag.

[pjohnmeyer]

TWG 3 May: Agreed we should add this to object types