fix: correctly merge restrictions (#234) #875

Job	Run time
test stable (ubuntu-latest)	55s
test stable --all-features (ubuntu-latest)	1m 55s
feature-checks	3m 6s
clippy	45s
test 1.83 (ubuntu-latest)	51s
doctest	1m 3s
test stable (macos-latest)	54s
fmt	13s
test stable --all-features (macos-latest)	2m 18s
docs	1m 8s
test 1.83 (macos-latest)	1m 6s
test stable (windows-latest)	2m 9s
test stable --all-features (windows-latest)	4m 13s
test 1.83 (windows-latest)	2m 2s
deny / cargo deny check	18s
	22m 56s

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