association.build broken in Egde?

I'm pretty sure this used to work pre-edge:

u = User.new

=> #<User id: nil, nickname: nil, created_at: nil, updated_at: nil>

l = u.listings.build

=> #<Listing id: nil, user_id: nil, title: nil, text: nil, created_at:
nil, updated_at: nil>

l.user

=> nil

u.listings

=> []

User/Listing have a very basic has_many/belongs_to relationship.

Am I imagining things, or did some of the recent changes to AR break
something?

Thanks,
Hendrik

...or not. I'm probably just getting something wrong. Anyway, I'm
getting the same thing in a 2.0.2 based app, so please disregard my
message. Apologies for the confusion!

- Hendrik