Re: write-file could carry permissions

[Richard Stallman]

    $ chmod +x something
    $ emacs something
    C-x C-w somethingelse
    $ ls -l #shows that the executable permissions were not carried along,
    as a convenience...

If you write the buffer into a different file, I don't see why the
permissions would be the same.  However, this suggested to me that
maybe Emacs should always set the executable bit when you edit a file
in Shell Script mode.  Is there any reason that would be bad?