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[3.12] `typing.NewType` docs: the future performance improvements are now in the past (GH-105354) (#105414)

`typing.NewType` docs: the future performance improvements are now in the past (GH-105354)
(cherry picked from commit 5f65ff0370e1123084ff300a5ff02cd57623b575)

Co-authored-by: Alex Waygood <Alex.Waygood@Gmail.com>
M
Miss Islington (bot) committed
f4969eb315fbbb80c476afbcdeacd0695ac7fb9b
Parent: 84133c5
Committed by GitHub <noreply@github.com> on 6/7/2023, 3:55:37 AM