This adds support both to pathlib.PurePath's constructor as well as
implementing __fspath__(). This removes the provisional status for
pathlib.

Initial patch by Dusty Phillips.

positional-only and keyword parameters in the same function.

  unused and outdated icons.

  unused and outdated icons.

Patch by Arthur Carcano.

Delete now unneeded tk version tests and code for older versions.

Part of PEP 519.

negative number without setting an exception.

a negative number without setting an exception.

(Upstream is https://github.com/python/typing)

- Add TYPE_CHECKING (false at runtime, true in type checkers) (upstream #230).
- Avoid error on Union[xml.etree.cElementTree.Element, str] (upstream #229).
- Repr of Tuple[()] should be 'Tuple[()]' (upstream #231).
- Add NewType() (upstream #189).