Intersection speedup and refactor #282

Job	Run time
run-test-performance (ubuntu-latest)	4m 16s
run-tests (ubuntu-latest)	3m 41s
run-test-performance-base (ubuntu-latest)	4m 36s
run-test-performance (macos-latest)	6m 30s
warnings-base (ubuntu-latest)	3m 18s
run-tests (macos-latest)	4m 55s
run-test-performance-base (macos-latest)	5m 49s
warnings-base (macos-latest)	3m 39s
warnings-new (ubuntu-latest)	3m 17s
warnings-new (macos-latest)	3m 53s
compare-versions (ubuntu-latest)	6s
compare-versions (macos-latest)	7s
code-coverage	2m 34s
compare-performance (ubuntu-latest)	27s
compare-performance (macos-latest)	59s
	48m 7s

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