LinearAlgebra/addmul/mul!(::Matrix{Float64}, ::LinearAlgebra.LowerTriangular{Float32, S} where S<:AbstractMatrix{Float32}, ::LinearAlgebra.Bidiagonal{Float32, V} where V<:AbstractVector{Float32}, α, β)/α = true, β = false/α = 0 ignores A .= NaN @test returned_mat === Ccopy