Here we see the "d" items are mixed with the "m" items,
but the "m" isn't shown:
set 42.1527288 -87.8284360 42.1817060 -87.8275970
geod +ellps=GRS80 -I <<EOF
$@
EOF
1d14'1.178"     -178d45'56.794" 3219.433

But you are right,
$ set $(units --terse 1mi)
$ echo $1
1609.344
Me throwing away $2 without double checking it is really "m" will come
back to bite me one day.

Anyway my only goal was to reduce needing a post processing method to edit
the result. (And thus needing different methods on differing operating
systems.)

I was just hoping there was a way to say
units --give-me-just-how-many-meters(feet, etc.)-please

maybe

units --number-only --expecting meters .

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