Follow-up Comment #10, bug #60602 (project groff):
CSTR 54 is correct. Branden's 'guess' is wrong and no change from Bell Labs
troff's normal and documented behaviour should be made based on it. vflag is
used to indicate the motion is vertical. It is nothing to do with forcing a
unit calculation to be vees. The code of makem(), quoted but not analysed
above, makes this clear.
groff's behaviour and documentation should copy both CSTR 54 and the historic
behaviour which as are in agreement are therefore correct.
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