Add is_substring (#2018) #4771

Job	Run time
macOS 13 (x86_64)	3h 22m 37s
macOS 14 (arm64)	2h 11m 40s
combine-standalone	14s
publish-standalone	15s
test-standalone (macos-13)	16s
publish-standalone (-x86_64)	17s
test-standalone (macos-14)	12s
publish-standalone (-arm64)	13s
test-standalone (macos-latest)	14s
test-standalone (-x86_64, macos-13)	16s
test-standalone (-x86_64, macos-14)	17s
test-standalone (-x86_64, macos-latest)	15s
test-standalone (-arm64, macos-14)	19s
test-standalone (-arm64, macos-latest)	10s
macos-check-all	1s
	5h 37m 16s

Provide feedback