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Tim at Lone Pine Koala Sanctuary
Re: All short answers are marked wrong (gradedwrong)
Group DevelopersGroup Documentation writersGroup Particularly helpful Moodlers

The shortanswer code also checks that Normalizer is present. The issue is that even when it exists, it may return null "When an error occurs". The only clue we have is that, according to one of the user comments on the docs, input that is not UTF-8 may be an error, but it is not clear.

 
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