Subject: Re: bug#51669: some patterns which should match 0x0 don’t do so

From: Paul Eggert <[email-masked]>
Date: Sun, 7 Nov 2021 16:37:17 -0800

That's a feature not a bug; see:

https://www.gnu.org/software/grep/manual/html_node/File-and-Directory-Selection.html

and look for --binary-files. You can use 'grep -a' to pay more attention 
to binary data.