I'm pretty sure the goal of reproducible builds is to be able to get the same binary as made somewhere from the source code. Arguably binaries are a form of mem

I'm pretty sure the goal of reproducible builds is to be able to get the same binary as made somewhere from the source code. Arguably binaries are a form of memoizing / caching if you look at compilation as a pure functional problem. For example, if I have build system that says "with file a hash = 1234 and file b with hash = 4321 I should get a binary with hash = 9876 you can save time compelling that package to check its hash by simply asking the binary repo for a package with hash 9876.