Codecov allows for PRs to be blocked from merging if the code coverage drops too much. As of right now I have seen coverage for things like pydoc vary too much to do that yet. We should probably work towards figuring out what is leading to that coverage variance and fix it so we can require coverage never gets worse.

If people do come across modules whose coverage seems to drop unexpectedly, please mention them here so we know what modules need to have their tests fixed.