FIX: Add isinstance checks to improve linting #1415

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Run time

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Job	Run time
macos-3.9	10m 43s
ubuntu-3.9	4m 15s
windows-3.9	13m 18s
macos-3.10	7m 25s
ubuntu-3.10	4m 16s
windows-3.10	11m 12s
macos-3.11	8m 50s
ubuntu-3.11	4m 18s
windows-3.11	12m 5s
	1h 16m 22s