Changed behaviour with \MakeTextUppercase and latex-dev

[Nicola Talbot]

I've had a bug report regarding an odd result with latex-dev and a 
rollback version of glossaries-extra. Since it doesn't affect the 
current version of glossaries-extra with the current version of 
glossaries, it's not something I'm considering a bug in either package 
(neither now load textcase). However, I thought it worth investigating.

The original bug report is at 
https://www.dickimaw-books.com/bugtracker.php?key=285 but I've narrowed 
it down to the following MWE:

\documentclass{book}
\usepackage{textcase}

\begin{document}
\MakeTextUppercase{\chaptername}
\end{document}

With the current LaTeX release the result is "CHAPTER". With latex-dev 
the result is "enChapter".

Regards
Nicola
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