@JosephWright I never thought we were aiming for a 1:1 reimplementation, but more for a sensible alternative with cleaner interface and cleaner backend, so I'm fine with basically any name (how about scotty.cls, it could beam your presentation up)
@UlrikeFischer I'd have assumed the same, but @DavidCarlisle for instance said you should put \RequirePackage{array} outside of an \ExplSnytaxOn-scope.
@DavidCarlisle what should we do about the colortbl tagging issue (github.com/latex3/tagging-project/issues/80)? I could temporarly put the new \endarray definition into the latex-lab firstaid. Or should colortbl be updated directly?
@DavidCarlisle öh, sorry which update? The new array code will be there with the next latex, so you probably should test the format date or the package date?
@UlrikeFischer no I meant the code needed in colortbl. Can I not just add \CT@end to the end of \endarray so it wiill work in old or new code, or does it need more?
@DavidCarlisle Well yes, I assume that you only need to add \CT@end (that is what my fix does), but I don't know if you want to do it with patching or redefine \endarray explicitly. Currently you redefine \endarray.
naturally the main question is if one of the millions other tabular packages gets confused by the change in colortbl, but then you can blame me, so it should be ok.