reduce duplicate calls #47

Job	Run time
macOS / release / homebrew-clang	4m 34s
Windows / release / msvc	6h 0m 4s
macOS / debug / homebrew-clang	9m 51s
Windows / release / clang-cl	6h 0m 3s
macOS / release / system-clang	4m 11s
Windows / release / llvm	6h 0m 3s
macOS / debug / system-clang	5m 56s
Windows / debug / msvc	6h 0m 3s
Windows / debug / clang-cl	6h 0m 3s
Windows / debug / llvm	6h 0m 3s
	1d 12h 24m 51s

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