Alternates and push

At github my repo, digispeaker, has an alternate pointing to github's
local copy of Linus' tree. I ignored my tree for a month and then
pushed to it including 200MB of objects from Linus' tree. These 200MB
of objects were pushed up to the server, but these objects were
already in the alternates repository.

What's supposed to happen? Is something broken in github's setup, or
does pushing not take into account alternates?

-- 
Jon Smirl
jonsmirl@gmail.com