Hi, Can someone explain to me the relationship between pipenv and pip, from the perspective of pipenv's maintainers? For example, does pipenv currently reimplement anything that pip tries to do, or does it simply call out to pip through the CLI or through its internal API's? Does it have any preferences or future plans in this regard? How about upstreaming to pip fixes or things that would help pipenv? I've been contributing to pip more lately, and I had a look at pipenv's repository for the first time today. https://github.com/pypa/pipenv Given that pip's code was recently made internal, I was a bit surprised to see that pipenv vendors and patches pip: https://github.com/pypa/pipenv/tree/master/pipenv/patched/notpip Before I had always assumed that pipenv used pip's CLI (because that's what pip says you should do). I also noticed that some bugs in pipenv's tracker seem closely related to pip's behavior, but I don't recall seeing any bugs or PR's in pip's tracker reported from pipenv maintainers. Without knowing a whole lot more than what I've stated, one concern I have is around fragmentation, duplication of work, and repeating mistakes (or introducing new ones) if a lot of work is going into pipenv without coordinating with pip. Is this in any way similar to the beginning of what happened with distutils, setuptools, and distribute that we are still recovering from? --Chris