remove unnecessary depth and enforce existing isinstance_anything config #706

Job	Run time
check-run	6s
get-python-versions	4s
test-primary (3.13)	37m 34s
test-primary (3.9)	27m 42s
test-other (3.10)	29m 52s
test-other (3.11)	29m 36s
test-other (3.12)	32m 0s
Indicate completion to coveralls.io	14s
	2h 37m 8s

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