FastText: upper case or lower case

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Using the pre-trained model:

import fasttext.util
fasttext.util.download_model('en', if_exists='ignore')  # English
ft = fasttext.load_model('cc.en.300.bin')

both queries ft['HOME'] and ft['home'] works, but return different vectors.

What is the optimal query to make?

If I'm working with an uppercased corpus, should I transform it into a lowercased?

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