LinearAlgebra/addmul/mul!(::Matrix{BigFloat}, ::LinearAlgebra.UnitUpperTriangular{Int64, S} where S<:AbstractMatrix{Int64}, ::LinearAlgebra.UpperTriangular{Int64, S} where S<:AbstractMatrix{Int64}, α, β)/α = 1.802824984282348719233368683489970862865447998046875, β = false/adjoint and transpose/fa = transpose, fb = adjoint @test returned_mat === Ccopy