Github user dmjones500 commented on the issue:
https://github.com/apache/commons-lang/pull/251
We need to agree on the desired behaviour of the method. Based on the
signature, I think we can adjust it to support supplementary characters without
violating the implied contract of the method. The issue for me is about indexes.
Based on the JavaDoc description, I suggest we return the code unit index.
This is because the input is a `CharSequence` and the JavaDoc states:
> Finds the first index within a `CharSequence`, handling null.
Also, a `CharSequence` only has methods which operate on code unit indexes.
So returning a code unit index would be helpful for further operations on the
sequence.
What does everyone else think? We should obviously update the JavaDocs to
make it crystal clear what we decide, either way.
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