[Python-ideas] ExitStack: Allow exiting individual context managers

Hi guys, I'm using `contextlib.ExitStack` today, and pushing context managers into it. I find myself wanting to exit specific context managers that I've pushed into it, while still inside the `with` suite of the `ExitStack`. In other words, I want to exit one of the context managers but still keep the `ExitStack`, and all other context managers, acquired. This isn't currently possible, right? What do you think about implementing this? Thanks, Ram.