[issue35712] Make NotImplemented unusable in boolean context

[Josh Rosenberg]

Josh Rosenberg <shadowranger+python at gmail.com> added the comment:

Moving to 3.9 target, per Serhiy's request. PR has been rebased against master, including updating the What's New info to be in the 3.9 version, not 3.8.

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versions: +Python 3.9 -Python 3.8

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