Pandas Enhancement Proposals?
I was wondering if there has been discussion about having dedicated RFC / Proposals for larger changes to pandas? 

For example, after a rather heated discussion in #24046, @wesm [asked](https://github.com/pandas-dev/pandas/issues/24046#issuecomment-515492965):
> I question whether GitHub issues was the appropriate venue for this discussion compared with some form of RFC / design document.

I wanted to come back to this and maybe write such a design document, and therefore wanted to check what the thoughts of the core team are about this? Needless to say, the obvious candidates to model this after would be Python's [PEPs](https://www.python.org/dev/peps/) or NumPy's [NEPs](https://numpy.org/neps/), but maybe there could/should be pandas-specific departures.

I think this could benefit several high-impact design questions (e.g. around extension arrays or release plans). Actually, I have 2-3 other bigger PRs that eventually stalled in design discussion (and a few ideas of similar magnitude), where I could imagine that such a vessel would help move the discussion forward.