- Fix spurious readiness flags in some of the wait functions (:ticket:`#1141`).
- Fix high CPU usage using the ``wait_c`` function on Windows (:ticket:`#645`).
- Fix bad data on error in binary copy (:ticket:`#1147`).
- Respect `Copy.set_types()` in TEXT copy in C version, consistently with
the Python version (:ticket:`#1153`).
- Don't raise warning, and don't leak resources, if a builtin function is used
as JSON dumper/loader function (:ticket:`#1165`).
- Improve performance of Python conversion on results loading (:ticket:`#1155`).
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