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gh-109413: libregrtest: enable mypy's `--strict-optional` check on most files (#112586)

Co-authored-by: Victor Stinner <vstinner@python.org>
A
Alex Waygood committed
70a38ffb3d712f973eb17bd1bda541f238ae70d2
Parent: 5f6ac2d
Committed by GitHub <noreply@github.com> on 12/1/2023, 2:54:33 PM