I would particularly like to highlight a draft implementation (in pure Python
for now). Hopefuly this will be a useful for driving the discussion forward:
https://nbviewer.jupyter.org/gist/shoyer/1f0a308a06cd96df20879a1ddb8f0006

TODOs before merging:

• review from @mrocklin

Other TODOs:

• decide if we want to change what is passed on to __array_function__
  implementations: should we include overloaded_args and/or
  relevant_args as well as or instead of types?
• add some discussion about static typing / PEP-484?

@mhvk @hameerabbasi @ngoldbaum @mattip please leave a note if there's anything I missed from our previous discussion that you would like to see addressed in the NEP itself. Detailed discussion should of course be saved for the mailing list.