Twist methods in spline (and other suggestions)

Aside of how difficult to control splines in general , but we have to go over it till something happen 😁 We all know archipak and it has a pretty interesting feature while creating handrails , it creates them with actually what you expect from a handrail to do on a curve (Right side example) .

But when you use curve modifier combined with array without further post process , you get this pretty sad result , and that what you get even after changing twisting method to Z-up in spline data properties , which made it a bit closer though it is still far So I guess it is all about twist method causing this problem we see here compared to archipak model on the right

Also other suggestion is to keep curve modifier aware of corners specially in poly type , by making a bisecting slicer on these corners with various modes like (continuous or mirror or stretch)

also twisting method will be pretty handy for shape bevels specially rectangular ones