additional Herb Sutter citation re integral index #151

Job	Run time
clang_16_build	6h 0m 14s
clang_18_build	6h 0m 13s
gcc_12_build	5h 59m 59s
clang_old_build (ubuntu-latest)	6h 0m 13s
msvc_build	4m 1s
clang_old_build (macos-latest)	6h 0m 15s
	1d 6h 4m 55s

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