Alias units in contextUnits.pl

[pstaabp]

Writing some new problems using the new context Units and have a possible bug with plurals (aliases). Here's an MWE:

DOCUMENT();
loadMacros('PGstandard.pl', 'PGML.pl', 'contextUnits.pl');

Context('Units')->withUnitsFor('volume');

$vol = Compute("100 ml");

BEGIN_PGML
Convert [$vol] to cups. [_]{$vol->toUnits('cups')->with(sameUnits =>1)}
END_PGML

ENDDOCUMENT();

Entering the correct answer "0.42267 cups" gives the right answer, but "0.42267 cup" does not give credit for the units. Is this intended?

[dpvc]

I've made a PR that should address the issue for you. Aliased units were not considered the same for sameUnits => 1, as you have pointed out, but they should be, and the PR should make that happen.

Thanks for the careful testing!