[Distutils] Should MANIFEST.in be automatically included by sdist?

[Terrel Shumway]

When I create a package using MANIFEST.in, there is important
information in that file. When I build a sdist, MANIFEST.in is ommitted,
meaning that the package cannot reproduce itself.

I think that if MANIFEST.in exists, it should automatically be included
by sdist. If I add MANIFEST.in to itself, it gets included in all (even
built) distributions, which I do not want.

Am I missing something?

-- Terrel