Deprecation of `ones(::AbstractVector)`

This is a somewhat ugly mess:

julia> ones(@SMatrix [0;])
┌ Warning: `ones(A::StaticArray)` is deprecated, use `ones(typeof(A))` instead.
│   caller = top-level scope at none:0
└ @ Core none:0
1×1 SArray{Tuple{1,1},Int64,2,1}:
 1

julia> ones([0;])
┌ Warning: `ones(a::AbstractArray)` is deprecated, consider `fill(1, size(a))`, `fill!(copy(a), 1)`, or `fill!(similar(a), 1)`. Where necessary, use `fill!(similar(a), one(eltype(a)))`.
│   caller = top-level scope at none:0
└ @ Core none:0
1-element Array{Int64,1}:
 1

But now

julia> ones(typeof(@SMatrix [0;]))
1×1 SArray{Tuple{1,1},Int64,2,1}:
 1

julia> ones(Int)
0-dimensional Array{Int64,0}:
1

Reproduce the two ones examples from the issue and compare the deprecated calls with ones(typeof(A)) and ones(Int). Trace the relevant ones methods in StaticArrays.jl and Julia, then establish the intended deprecation behavior and verify that the resulting outputs and warnings are consistent.