Intersection speedup and refactor #283

Job	Run time
warnings-new (ubuntu-latest)	3m 25s
run-test-performance-base (ubuntu-latest)	4m 51s
run-test-performance-base (macos-latest)	6m 38s
warnings-new (macos-latest)	3m 50s
run-test-performance (ubuntu-latest)	4m 56s
run-tests (ubuntu-latest)	3m 13s
run-test-performance (macos-latest)	6m 22s
warnings-base (ubuntu-latest)	2m 53s
run-tests (macos-latest)	3m 21s
warnings-base (macos-latest)	4m 6s
code-coverage	2m 35s
compare-versions (ubuntu-latest)	10s
compare-versions (macos-latest)	12s
compare-performance (ubuntu-latest)	34s
compare-performance (macos-latest)	44s
	47m 50s

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