LinearMaps.jl

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If we set the trait FiveArg(), is it also necessary to implement the three argument mul!? Something like:

LinearMaps.MulStyle(A::MyMap) = FiveArg()

function LinearMaps._unsafe_mul!(y, A::MyMap, x::AbstractVector, α, β)
    ...
end

LinearMaps._unsafe_mul!(y, A::MyMap, x::AbstractVector) = LinearMaps._unsafe_mul!(y, A, x, 1, 0)

If so, it would be useful to note this in the "Custom Maps" section of the documentation. If you don't need to do this then I have some other issue... :)