Revert "found much simpler formulation of zero-volume check"
Revert "found much simpler formulation of zero-volume check"

This reverts commit 15a626ebe4dae25025839db68b2d1be95bad042e.

kaushik94/tardis,orbitfold/tardis,Tobychev/tardis,Tobychev/tardis,orbitfold/tardis,orbitfold/tardis,Minhmo/tardis,kaushik94/tardis,Minhmo/tardis,Tobychev/tardis,kaushik94/tardis,orbitfold/tardis,Minhmo/tardis,kaushik94/tardis