Re: why have a .Y register? (was: groff 1.24.0.rc1 available for evaluation)

[G. Branden Robinson]

At 2026-01-19T12:33:45-0600, G. Branden Robinson wrote:
> At 2026-01-19T12:20:10-0600, Dave Kemper wrote:
> > On Mon, Jan 19, 2026 at 11:31 AM G. Branden Robinson
> > <g.branden.robin...@gmail.com> wrote:
> > > Regarding `.y`, that feature crept in in the mid-1970s with
> > > Ossanna troff.[1]
> > 
> > Then groff_diff(7) is in error, as it lists registers .x, .y, and .Y
> > as GNU troff additions.

The man page should be clarified with respect to .x and .y, in that GNU
troff _gives them semantics_.

All versions of CSTR #54 that I have:
        Ossanna 1976
        Kernighan 1981
        Kernighan 1982

...document .x and .y identically as follows.

        .x      Reserved version-dependent register.
        .y      Reserved version-dependent register.

Regards,
Branden

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