Subclasses nested in superclasses show up redundantly

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This minimal repro case

goog.module('AbstractList');
class AbstractList {}
AbstractList.Mutable = class extends AbstractList {};
AbstractList.ArrayList = class extends AbstractList.Mutable {};
exports = AbstractList;

results in the following types in the left-hand panel:

• AbstractList
• ArrayList
• ArrayList.ArrayList
• ArrayList.Mutable
• ArrayList.Mutable.ArrayList
• ArrayList.Mutable.Mutable
• Mutable

The various aliases are marked as such, but there's still a lot of redundancy (and somewhat strange which are duplicated and which aren't - e.g. why no Mutable.Mutable?).

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Furthermore, if I move ArrayList to its own file, rather than nesting it, I also end up with a very strange AbstractList.able class, which is marked as yet another alias to AbstractList.Mutable.