Github user MarkDacek commented on the issue:
https://github.com/apache/commons-lang/pull/251
Chiming in here. I'd recommend using code units so that it's compatible
with the other operations like substring. Of course, this would still break if
you called substring(index+1) since you'd be taking the second byte of a
supplementary character, but I'd still argue that this is the path to take.
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