Fix comparison for non-dominated to account for tolerances

[odow]

It's the cause of #115 failing

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.85%. Comparing base (94393c8) to head (69e18f9).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #118      +/-   ##
==========================================
- Coverage   98.85%   98.85%   -0.01%     
==========================================
  Files           9        9              
  Lines         960      959       -1     
==========================================
- Hits          949      948       -1     
  Misses         11       11              

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.