mod_negotiation and differing MIME types

I'm working on a new site on which I want to look at the preprocessed
source a lot. I got tired of having to view it in the console window all
the time, so I had the idea to make an alias to the directory that
served up .html as text/plain:

Alias /foo-src /path/to/htdocs/foo
<Location /foo-src>
AddType text/plain html
</Location>

This actually works... or, it would work if I weren't using MultiViews
on folder foo. Right now, the published URL for a html file in directory
foo is <http://example.com/foo/bar>, which serves up bar.html. When I go
to <http://example.com/foo-src/bar.html>, it serves as text/plain, which
is what I want... but when I go to <http://example.com/foo-src/bar>, it
goes back to text/html.

This seems weird to me. Is mod_negotiation just looking at mime.types
and ignoring my AddType directive? The mod_negotiation page says that it
"effectively fakes up a type map which names all those files, assigning
them the same media types and content-encodings it would have if the
client had asked for one of them by name." But that's clearly not
happening here.

Is this a bug, and/or is there a different way I should be implementing
this?

--
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Kim Scarborough http://www.unknown.nu/kim/
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