[bug #63587] [troff] set .R register to maximum representable integer

[Dave]

Follow-up Comment #10, bug #63587 (group groff):

[comment #5 comment #5:]
> I can think of no situation where a user might need 10,001
> registers, so, despite this number having no clear connection to
> any internal groff limit, it's probably a reasonable limit to
> _claim_ to the user who asks.  It will enable the processing of
> any ancient roff documents that do test this register,

I have to backpedal on my own argument here: this point, as far as I can see
now, remains just as true no matter what big number .R holds.  Groff having no
fixed register limit, 10,000 and INT_MAX are equally wrong values to return,
but equally useful in terms of back compatibility to documents for ancient
troffs.


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