As suggested by @boriskaus, do not just test on Julia v1.6 but also on the latest released version (semver '1'). Let's keep v1.6 around for a while, as it helps to maintain a certain level of backward comparability.
Coverage: 94.258% (+0.2%) from 94.089% when pulling 6ad42f5e576566418898ae34d9c7f8113442a859 on msl/test-on-latest-julia into 9bcc278469256423c12d5844d045cad4e0c22ae7 on main.
As suggested by @boriskaus, do not just test on Julia v1.6 but also on the latest released version (semver '1'). Let's keep v1.6 around for a while, as it helps to maintain a certain level of backward comparability.