Fix non-mutating interface (could produce NaNs)
Don't check previous x's if you're not going to update the values! (#95) * Don't check previous x's if you're not going to update the values! * fix tests and default chunk
Don't check previous x's if you're not going to update the values! (#95) * Don't check previous x's if you're not going to update the values! * fix tests and default chunk