Trying to use Array.getPackage() or any predicate depending on it, such as Array.getQualifiedName(), causes a compilation error:

Expr::ExprParent incompatible with Type::Array in context

The underlying problem seems to be that RefType.getPackage() only considers classes and interfaces, but not arrays. Maybe for arrays it should be compilable but simply have no result (should be documented in getPackage() and getQualifiedName() for RefType and Array then; maybe for other predicates as well)?

Relates to #5320