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gh-143010: Prevent a TOCTOU issue by only calling open once#143011
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… TOCTOU issue by only calling open onceWe can literally just use open(path, 'xb+') for _create_carefully.
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Can you please start with a failing test that can show us what's wrong?
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We can literally just use open(path, 'xb+') for _create_carefully
mailbox._create_carefullyhas a possible toctou error #143010