Rik Kabel schrieb am 08.06.2021 um 23:01:
Yes, that works. Of course, to say that you can never be sure if such combinations will work is not a welcome statement about the state of ConTeXt.
More recent LMTX releases also now break older documents that worked (with LMTX and MkIV) before. If there is an error in what was previously written that is only noticed because of tighter enforcement, that is one thing, but an undocumented change to supported behaviour is less to be desired. And that it works with dimensions but not on/off/yes/no is very strange and suggests some other problem may be lurking.
Just because it did work doesn't mean it was intended to be used in this case. The different behavior between keywords and dimensions is a result of the different ways how the are implemented and the way TeX (the engine) works when it reads arguments. Wolfgang