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/cc @adgad 
Yep, but they are logically different things.

favourites (plural) you are operating on the whole list - Eg, get a list of favourites, clear a list of favourites.

With favourite (singular) you are operating on single items.

So I avoided overloading the pluralised version as you end up with clashes - Eg, deleting a list Vs. deleting an item in the list.