Fix `test` and `validate` obsolete Draft 4 warnings #103

Job	Run time
docker	1m 24s
test (ubuntu-latest, clang, clang++, sh)	1m 11s
test (ubuntu-latest, gcc, g++, sh)	56s
test (macos-latest, clang, clang++, sh)	47s
test (windows-latest, pwsh)	3m 55s
	8m 13s

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