Visible corners in variable width curves
Follow up to #43 (closed), !46 (merged) only addressed pressure bumps. Corners are still visible on quick-stroke variable width curves.
It seems D3 only interpolates on single path elements. Variable width path elements are impossible so a new path element is required for each change in width.
Unless one of these assumptions is false, we need to figure out how to smoothly connect two path elements which share an end.
Edited by Nayeem Rahman