robotlegs/robotlegs-framework — comment on commit 4c56ab372f04a415dd6b473cd119d3df2b23d130
File: src/org/robotlegs/v2/extensions/mediatorMap/MediatorMapExtension.as line 43
By darscan:

Oops, that should be IViewHandler. But anyway, yes you're right. It should be typed as MediatorMap in the extension, but mapped into the injector as an IMediatorMap and installed into the ViewManager as an IViewHandler.