Add collection/array of layers in ol.Map.AddLayer

Following #274, I've seen that ol.Map.AddLayer is available.

My main problem is with habits from OL2, I want to be able to add multiple layers at once.
Can the signature and the method be changed to deal with this use case (one layer only for the moment)?

To quote @elemoine, "I see these as convenience methods to add and remove layers to and from the layers collection"
There is an "s" in the term "layers" ;)