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Based on discussion  Mock is using "install_weak_deps=0" and Koji should behave the same.
This will need a bug filed for koji. this is an area where we just use the koji defaults.
Hope this is still the right tracker for Koji:
after thinking about this some I think that all deps should be installed into the buildroot. I am going to close this as won't fix. This really needs to have more thought. and discussion before anything is done. there is work, tradeoffs and unexpected results regardless of what is done.
Metadata Update from @vondruch:
- Issue set to the milestone: Fedora 24 Alpha
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