For the conformal path, volumes are represented by a closed surface is closed and it spans over a sufficient number of cells it should still represent a volume. Therefore we should check that closedness is preserved in that case.
There is also the case that for a very small volume, it can degenerate into lines or points. Those cases are acceptable and closedness is not expected. However the cells where that happens should be staircased.
For the conformal path, volumes are represented by a closed surface is closed and it spans over a sufficient number of cells it should still represent a volume. Therefore we should check that closedness is preserved in that case.
There is also the case that for a very small volume, it can degenerate into lines or points. Those cases are acceptable and closedness is not expected. However the cells where that happens should be staircased.