Test

Prevent mode='r+' from creating new directories #5157

Job	Run time
doctests	1m 12s
py=3.13-upstream	11m 52s
py=3.11-min_deps	12m 3s
os=ubuntu-latest, py=3.12, np=1.26, deps=minimal	4m 54s
os=ubuntu-latest, py=3.11, np=2.2, deps=minimal	4m 42s
os=ubuntu-latest, py=3.11, np=1.26, deps=optional	6m 17s
os=ubuntu-latest, py=3.12, np=1.26, deps=optional	6m 32s
os=ubuntu-latest, py=3.11, np=1.26, deps=minimal	4m 53s
os=ubuntu-latest, py=3.12, np=2.2, deps=minimal	4m 58s
os=ubuntu-latest, py=3.11, np=2.2, deps=optional	6m 32s
os=ubuntu-latest, py=3.13, np=1.26, deps=optional	10m 24s
os=ubuntu-latest, py=3.13, np=2.2, deps=optional	7m 5s
os=ubuntu-latest, py=3.13, np=2.2, deps=minimal	5m 15s
os=ubuntu-latest, py=3.12, np=2.2, deps=optional	6m 22s
os=ubuntu-latest, py=3.13, np=1.26, deps=minimal	8m 29s
os=macos-latest, py=3.13, np=2.2, deps=optional	4m 31s
os=windows-latest, py=3.13, np=2.2, deps=optional	12m 15s
os=windows-latest, py=3.11, np=1.26, deps=optional	9m 38s
os=macos-latest, py=3.11, np=1.26, deps=optional	4m 6s
Test complete	3s
	2h 12m 3s

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