Justin Phillips

We should make mypy checking more strict to ensure that new code is adding annotations. This is probably best done through tightening mypy configuration in `mypy.ini` (e.g disallow_untyped_defs)

Maximum 32 bit float value fails to round trip.

3

**What version of protobuf and what language are you using?** Version: 3.14.0 Language: Python **What operating system (Linux, Windows, ...) and version?** MacOS X 10.15.4 **What runtime / compiler are...