If I have a script class which has member variables which are handles to app-registered types, and I don't explicitly initialize them in the declaration or in the ctor, should they be automatically initialized to null?

For example:

class MyScriptClass
{
    private MyAppClass@ someHandle;
}

Thank you.

Handles are default-initialized to null. Other primitives are not default initialized. All other types use their default constructor, which could also be no initialization for POD types registered by the application.