minor itp speedups (#547) #405

Job	Run time
downgrade (1.10, core)	17s
downgrade (1.10, downstream)	18s
downgrade (1.10, wrappers)	19s
test (core, 1.10, ubuntu-latest)	17m 0s
test (core, 1.10, macos-latest)	29m 36s
test (core, 1.10, windows-latest)	27m 0s
test (core, 1, ubuntu-latest)	25m 12s
test (core, 1, macos-latest)	25m 14s
test (core, 1, windows-latest)	37m 50s
test (downstream, 1.10, ubuntu-latest)	10m 55s
test (downstream, 1.10, macos-latest)	7m 30s
test (downstream, 1.10, windows-latest)	15m 0s
test (downstream, 1, ubuntu-latest)	20m 49s
test (downstream, 1, macos-latest)	17m 28s
test (downstream, 1, windows-latest)	25m 24s
test (wrappers, 1.10, ubuntu-latest)	9m 15s
test (wrappers, 1.10, macos-latest)	6m 17s
test (wrappers, 1.10, windows-latest)	12m 48s
test (wrappers, 1, ubuntu-latest)	16m 30s
test (wrappers, 1, macos-latest)	10m 47s
test (wrappers, 1, windows-latest)	20m 21s
	5h 35m 50s

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