0.16 Release #2079

Now that Python 3.6's end of life date was reached (on December 24th), we don't have any external release blockers for 0.16.

There's still some things I would like to see finished off before 0.16:

• Migrating #[pyproto] to #[pymethods] #1884 - let's get the remaining protocols merged and #[pyproto] deprecated
  • Sequence Protocol - pymethods: seq methods from mapping methods #2065 seems most promising
  • Buffer Protocol - pymethods: support buffer protocol #2066 looks good enough for now
  • GC Protocol - pymethods: support gc protocol #2159
• Accept paths in wrap_* macros #1709
• PyMapping is inconsistent with typing.Mapping #2072 - a decision on whether PyMapping behaviour should be changed.
• #[pyclass] for fieldless enums #2034
• verify py method args count #2083

Additional nice-to-haves:

• Opt out of PyCell borrow tracking #1979 - this is currently blocked on me, so it depends how fast I can make progress on the other bits.
• Shortcut macros for collections #1703 - I think new collection macros would be very convenient, so would love to see the design for these agreed upon so we can ship them.

Help with reviewing these PRs / issues so that we can merge these things for 0.16 with confidence we've got the right design would be great. I would guess that we might not have 0.16 ready until mid to late Jan given the list of things above.