Hello, is it a forward or a backward (or both) differentiation library? How does the performnce of your code compare to Julia's autodiff source to source code?

Hello, is it a forward or a backward (or both) differentiation library? How does the performnce of your code compare to Julia's autodiff source to source code? Does it solve from the exp/sin/cos problem? (By differentiating a polynomial approximation you use an approximation one degree lower)