Overall a good read but some comments. 1. How are partial rebuilds and dependencies handled? I assume that this is done from scratch based on only using the st

Overall a good read but some comments. 1. How are partial rebuilds and dependencies handled? I assume that this is done from scratch based on only using the standard library but this seems like quite a bit if code to write. (Not exactly complex, but not trivial either.) 2. It days that Google fingured this out using Python for the build. This is presumably referring to Bazel but Bazel doesn't actually do the build in Python. You just write the build description in Python with very limited logic allowed. It is much more of a configuration language than a build script.