Follow-up Comment #14, bug #66392 (group groff): [comment #13 comment #13:] > meeting your expectations would make `.hla` > the only predefined register, I think, that would automatically > come and go from existence as one changed environments.
I did consider (but didn't write down, so you'd have no way of knowing that)
that this might make \n[.hla] an outlier among predefined registers. And I
could see that being enough of a design wart to want to avoid it. However...
> What other predefined registers do you perform existence checks
> on, and under what circumstances?
True, the situation's never come up before. But .hla is sort of an outlier in
this regard anyway: any other predefined register I can think of always has a
meaningful value. For most (maybe all) of them, a value of 0 doesn't
correspond to "undefined," but to "off" or an actual measurement of 0. Are
there any other predefined registers that track a thing that simply might not
be set at all?
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