Fixes according to review notes (more accurate type for tree_class) #1400

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Job	Run time
build (3.6)	49s
build (3.7)	42s
build (3.8)	32s
build (3.9)	36s
build (3.10)	30s
build (3.11)	26s
build (pypy-3.7)	1m 35s
	5m 10s