The valid, help and object_name members are present in many other types (though not all of them). The meaning of the members is
the same across all types.
All methods and properties that this object supports.
Is this object valid? This Lua object holds a reference to an object within
the game engine. It is possible that the game-engine object is removed whilst
a mod still holds the corresponding Lua object. If that happens, the object
becomes invalid, i.e. this attribute will be false. Mods are advised to
check for object validity if any change to the game state might have occurred
between the creation of the Lua object and its access.
The class name of this object. Available even when valid is false. For LuaStruct
objects it may also be suffixed with a dotted path to a member of the struct.