- Codecov cannot handle as many coverage reports as we are generating
- as a result, our PR coverage pages have been broken for a while, and
it's hard to tell people where to enhance their testing in PR reviews.
- Scale back to only running coverage for 3.7 and 2.7 unit tests
- This is *probably* better. We run the build tests for good measure,
but we do not need to evaluate them for coverage. The coverage reports
are about unit tests.
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