would be consistent, but I left that out because the interactions are all included by default anyway, so you would normally only extend if you were adding your own, which I would have thought unlikely. I suppose I could change controls and interactions to say that, as these are a collection, you can use any of the methods in ```ol.Collection```, such as ```extend()```, to adapt to your needs, but maybe that would confuse newbies - the people for whom the docs are most useful.