It was only used for type-related nullability/mutability
annotations and it was necessary to remove them
in the descriptor renderer (duplicating their fqnames there).
At the same time they're only needed for types enhancement
where they can be simply restored from type owners' descriptors
The testData changes are more or less correct: this kind of annotations
is bound both to types themselves and their use because of their targets
Denis Zharkov
57b7b91444