LinearAlgebra/addmul/mul!(::Matrix{BigFloat}, ::LinearAlgebra.SymTridiagonal{Float64, V} where V<:AbstractVector{Float64}, ::LinearAlgebra.SymTridiagonal{BigFloat, V} where V<:AbstractVector{BigFloat}, α, β)/α = 0.6457571082693862596357803340652026236057281494140625, β = 0.0/adjoint and transpose/fa = transpose, fb = transpose @test returned_mat === Ccopy