Fix windows mysterious, uncharted bug #23

Job	Run time
macOS / release / homebrew-clang	6m 33s
macOS / debug / homebrew-clang	4m 58s
macOS / release / system-clang	3m 49s
macOS / debug / system-clang	3m 33s
Windows / release / msvc	25m 5s
Windows / release / clang-cl	23m 40s
Windows / release / llvm	24m 10s
Windows / debug / msvc	24m 53s
Windows / debug / clang-cl	25m 11s
Windows / debug / llvm	26m 35s
	2h 48m 27s

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