Failing build with numpy 1.19.0:
https://app.circleci.com/pipelines/github/lace/polliwog/836/workflows/b88ac698-51bc-46ea-80b8-f9e57e7157d9/jobs/2618/steps

Passing build with numpy 1.18.4:
https://app.circleci.com/pipelines/github/lace/polliwog/793/workflows/dd32545c-872a-4547-9819-0de088c9f7b8/jobs/2535/steps