Both old and new groff behave in the following way: Literal tabs are

considered normal word characters even when delimiting column phrases
in .Bl -column.  Thus, in any column but the last, if the column is
terminated by a literal tab, and the last character is a solitary dot,
that dot is NOT considered punctuation, and consequently offset from
the preceding text by a blank space.  This space does not occur when the
Ta macro is used inmstead of a literal tab, or when a blank character is
inserted between the dot and the tab.

Confused now?  So were we.
We decided to consider that a bug in groff, not a feature,
and to not emulate it in mandoc(1).
Thus, let operator(7) no longer depend on that groff bug.

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