It is lowercase only. But lowercase in number case. The upper and lower case is distinguished based on alignment in this, where in text case it is based on shape and/or size.
Edit: my use of the words number case and letter case does not look like the standard words. But the concept still exist. Check this: https://totallytype.com/figures.php
Main issue I have with the 80-20 rule is this. That 20% is almost always the people with disabilities. My answer to people who sometimes claim the product we are building does not need much accessibility features, because
<insert stupid reason>
, is "then you should find a differenr job".Key point is disability does not just mean people without a limb, or people without good eye sight. There are a lot of people with disabilities that are not easily visible as in the case of OP. It can be trembling hands, motion sickness, learning disabilities like dyslexia, ADHD, migrain, and the list goes on. If diversity disturbs one person, they almost always have very high privileges.