tests

tests #509

Job	Run time
Tests (8.1, ubuntu-latest, prefer-lowest)	17s
Tests (8.1, ubuntu-latest, prefer-stable)	18s
Tests (8.1, macos-latest, prefer-lowest)	1m 19s
Tests (8.1, macos-latest, prefer-stable)	1m 38s
Tests (8.1, windows-latest, prefer-lowest)	41s
Tests (8.1, windows-latest, prefer-stable)	37s
Tests (8.2, ubuntu-latest, prefer-lowest)	17s
Tests (8.2, ubuntu-latest, prefer-stable)	24s
Tests (8.2, macos-latest, prefer-lowest)	1m 28s
Tests (8.2, macos-latest, prefer-stable)	1m 21s
Tests (8.2, windows-latest, prefer-lowest)	40s
Tests (8.2, windows-latest, prefer-stable)	39s
Tests (8.3, ubuntu-latest, prefer-lowest)	37s
Tests (8.3, ubuntu-latest, prefer-stable)	18s
Tests (8.3, macos-latest, prefer-lowest)	1m 19s
Tests (8.3, macos-latest, prefer-stable)	1m 18s
Tests (8.3, windows-latest, prefer-lowest)	37s
Tests (8.3, windows-latest, prefer-stable)	38s
	14m 26s

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