[2677753384] Upstream Reporter: Shubh Bapna
Upstream description:

Currently bootstrap resolves a dependency, downloads the sources and then checks whether it had already seen that dependency. We should check whether we have already seen the dependency right after resolution because even though we don't re-download the tarballs we recheck whether the tarball is valid everytime we encounter the same dependency. Checking whether the tarball is valid or not can be a quite expensive operation especially for huge tarballs like torch