Tests

Fix scheme comparison #10

Job	Run time
Tests (8.4, ubuntu-latest, prefer-lowest)	20s
Tests (8.4, macos-latest, prefer-stable)	1m 28s
Tests (8.4, ubuntu-latest, prefer-stable)	9s
Tests (8.4, windows-latest, prefer-stable)	47s
Tests (8.5, ubuntu-latest, prefer-stable)	8s
Tests (8.5, windows-latest, prefer-lowest)	56s
Tests (8.4, windows-latest, prefer-lowest)	56s
Tests (8.5, windows-latest, prefer-stable)	45s
Tests (8.5, macos-latest, prefer-stable)	1m 30s
Tests (8.5, ubuntu-latest, prefer-lowest)	10s
Tests (8.5, macos-latest, prefer-lowest)	1m 23s
Tests (8.4, macos-latest, prefer-lowest)	1m 15s
	9m 47s

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