On 27/05/2014 16:58, Bruno Le Floch wrote: > I tend to agree with you that we should not let \__dim_strip_pt:n and > \__dim_strip_bp:n accept arbitrary junk. That's easy to change, as > they are only used internally. On the other hand, the public > \dim_to_pt:n and \dim_to_unit:n are documented as allowing multiple > units, for the use-case Joseph describes. If you look over the current actual uses in the LaTeX kernel, they are focussed purely on some aspects of font use. I suspect we'd be better, long-term, to allow this sort of thing if at all only at the interface layer, and to have all of the 'general' code stuff expect 'well defined' dimensions. Means a doc change, but I feel an reasonable one. -- Joseph Wright