Yeah, let's just totally nuke ``size`` everywhere in here, we don't need it (for now).  Another idea I had is...these "special case" subclasses, we could just stick them into the subtests that care about them.  In other words, you can have the small behaviour changes where/when they're needed, and benefit from them w/o polluting the general interface :)   I think this solution would work for my ``DockerContainersCLICheck`` too since IIRC, it's only used by a single subtest.