GD0402 exception for abstract classes

[orolyn]

https://docs.godotengine.org/en/stable/tutorials/scripting/c_sharp/diagnostics/GD0402.html

This restriction (and the bugs it used to cause) was because the editor expected the class to be instantiatable. Which is understandable. However I wondered if this rule could be relaxed if the class was abstract, alternatively, if a generic class has the [GlobalClass] annotation, treat it like a base class in the hierarchy and use the basic name of the class.

Either way, it wouldn't need to be considered instantiatable. This would allow us to derive from a generic class with a concrete class and still use the annotation. Is this possible?