RE: Q on read-file-name and completion-ignored-extensions

[Drew Adams]

    > emacs -q
    > (setq completion-ignored-extensions (cons ".el"
    > completion-ignored-extensions))
    >
    > cd to a directory with .el files
    > M-: (read-file-name "foo: ")
    >
    > Type the beginning of the name of one of the .el files - e.g.
    > app, then TAB.
    >
    > I see all files starting with "app" in *Completions*,
    > including .el files.
    > If there is only one matching file, then its name is inserted in the
    > minibuffer.

    Not for me, in Emacs 21.4 on Solaris 9.  Try it with
    `emacs -q --no-site-file`
    just to make sure it's not a problem with your local configuration.

The plot thickens...  Stefan confirms the behavior I see and he says that it
is by design. Keven does not see the same behavior.

I did use emacs -q --no-site-file, BTW. I suspect now that the difference
might be the platform (I'm on Windows). So, which behavior is by design?