You can clone with
Some formulae always install universal. So ENV.universal_binary should add "--universal" or something equivalent to the install receipt even though the user did not explicitly pass that in.
This will help us out when formulae start being able to ask for universal deps.
Sounds good. Eventually I don't think anything should install universal by default though, once we can just specify deps instead.
Looking at this, ENV.universal_binary probably has to set @universal = true and learn ENV.universal?; then Tab.for_install can add :universal => args.build_universal? or ENV.universal?
@universal = true
:universal => args.build_universal? or ENV.universal?