Download patch
ref: 8589a591dee9ccb46e09fbb5bf6962cabd178f98 parent: 2f67e21393c25943f25e116fa6912b7d92dbca4e author: Ori Bernstein <ori@eigenstate.org> date: Sat Mar 28 16:32:53 EDT 2020
we prefer nil over 0, make the example show it.