[boost] Code coverage tests

A number of libraries have code coverage/project tests in Github. I am not against such tests but I am against the idea that "failing" such a test, whatever that means, should prevent a PR from being merged into a Boost library. To me it is nonsense that a perfectly logical change to software should lead to some code coverage "failure", and that therefore the change should be deemed incorrect. I admit I do not know what the criteria are for code coverage but I do not see code coverage determining whether any change to a library is incorrect or not.