chore: Allow opening pre-existing unnamed storage #3498

Job	Run time
Type check / Type check (3.10)	42s
Type check / Type check (3.13)	41s
Docs check / Docs check	1m 45s
Type check / Type check (3.11)	35s
Type check / Type check (3.12)	43s
Lint check / Lint check (3.11)	26s
Lint check / Lint check (3.10)	23s
Lint check / Lint check (3.12)	28s
Unit tests / Unit tests (ubuntu-latest, 3.11)	2m 8s
Lint check / Lint check (3.13)	28s
Unit tests / Unit tests (ubuntu-latest, 3.12)	2m 12s
Unit tests / Unit tests (ubuntu-latest, 3.10)	2m 10s
Unit tests / Unit tests (windows-latest, 3.13)	2m 54s
Unit tests / Unit tests (windows-latest, 3.11)	2m 49s
Unit tests / Unit tests (windows-latest, 3.12)	3m 23s
Unit tests / Unit tests (ubuntu-latest, 3.13)	2m 8s
Unit tests / Unit tests (windows-latest, 3.10)	2m 58s
	26m 53s

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