New Duplo stud prim?

[Peter Blomberg]

There is a Duplo stud shape in between stud8 and stud28, i.e. where the inside has two straight segments on opposite sides of the circle. Stud8 has no straight segments and stud28 has four straight segments. The 2-straight segmented shape occurs at least in the picket fence 6497. I'd like to create the 2-straight segmented shape as stud38. Any objections?

Another variant has 4 small notches in each of the 45, 135, 225, and 315 degree angles. Occurs at least in the ladder 3519. Would be convenient to have such a stud primitive on hand.

Edit: Corrected stud8 name.