Probably a computaton error where the path wraps around from last node to first node.
Closed paths are denoted by an additional last node identical to the first node.
Version 1.4 rounds that nasty corner, but it also has an extra hack to the node we skipped for finding the prev vector.
Never thought that the cubic-super-path is such an ugly beast.
It says "Value 0 too small"
Probably a computaton error where the path wraps around from last node to first node. Closed paths are denoted by an additional last node identical to the first node.