1. Create a file with permission of 444 (read-only) file.
2. Open the file using emacs.
My emacs open the read-only file as writable buffer. Also, I can
modify it and save it. (AMAZING, emacs IGNORES unix file system. WOW.)
What happened to the emacs, and how it works properly (open files as
read-only if it is read-only, and as writable if it is writable.)
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