LinearAlgebra/addmul/mul!(::LinearAlgebra.Diagonal{Float64, V} where V<:AbstractVector{Float64}, ::LinearAlgebra.Diagonal{Float64, V} where V<:AbstractVector{Float64}, ::LinearAlgebra.Diagonal{Float64, V} where V<:AbstractVector{Float64}, α, β)/α = 0.906601960787754, β = false/α = 0 ignores A .= NaN @test returned_mat === Ccopy