Merge pull request #348 from elbeno/update-cpp20-branch #170

Job	Run time
usage_test (FREESTANDING, gcc)	1m 46s
usage_test (HOSTED, clang)	43s
usage_test (FREESTANDING, clang)	1m 25s
usage_test (HOSTED, gcc)	1m 10s
	5m 4s

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