Cylinder creation disalignment

[JansenSmith]

using code
// make a gently rounded cylinder
CSG top = new RoundedCylinder(radius,height)
.cornerRadius(10)// sets the radius of the corner
.toCSG()// converts it to a CSG tor display

// make a subtly rounded cylinder
CSG bottom = new RoundedCylinder(radius,height/2)
.cornerRadius(2)// sets the radius of the corner
.toCSG()// converts it to a CSG tor display

// union the two
CSG body = top.union(bottom)

Expected Outcome:
Two aligned and analogous rounded cylinders with no seam.

Actual Outcome:
Two cylinders that don't mesh well and have a seam:

see: Halloween2020TheChild/Zoltar@8fe8117#diff-e30852a13801f01807cb22b62a8344799a3d9137a43768a1acc639499032ba26

[madhephaestus]

I suspect the stair-step method for creating the cylendars is not correctly calculating the largest cylendars radius. This would be in JCSG, i think @JansenSmith should be able to fix it.