docstring & typehints in simplify.simplify_loop(), etc. (#112) #261

Job	Run time
ubuntu-latest, py311_sgeop-oldest	11m 58s
ubuntu-latest, py311_sgeop-latest	12m 8s
ubuntu-latest, py312_sgeop-latest	9m 53s
ubuntu-latest, py313_sgeop-latest	10m 18s
ubuntu-latest, py313_sgeop-dev	11m 1s
macos-13, py313_sgeop-latest	19m 30s
macos-latest, py313_sgeop-latest	8m 42s
windows-latest, py313_sgeop-latest	15m 23s
	1h 38m 53s

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