On Fri, Nov 15, 2019 at 11:54 AM NIDE, Naoyuki <nide@ics.nara-wu.ac.jp> wrote:
> echo ba | LANG=ja_JP.eucjp grep -F -w a
> outputs ba, but should output nothing.

Thank you for that report. It is reproducible for me on Fedora 30.
Here is a fix, but the commit is incomplete: I am still in the process
of preparing a test case and the NEWS entry.
Will also fix the erroneous comment just below in a separate patch.