LinearAlgebra/addmul/mul!(::Matrix{BigFloat}, ::LinearAlgebra.Bidiagonal{Int64, V} where V<:AbstractVector{Int64}, ::LinearAlgebra.LowerTriangular{Float64, S} where S<:AbstractMatrix{Float64}, α, β)/α = 0.257526921000072517298207230851403437554836273193359375, β = false/adjoint and transpose/fa = adjoint, fb = transpose @test returned_mat === Ccopy