fix: work around expression evaluation issue in conditions when e.g. … #259

Job	Run time
linux / setup	10s
macos / setup	23s
windows / setup	54s
linux / build-examples (gcc)	28s
linux / test (gcc)	1m 24s
linux / test (clang)	55s
linux / build-examples (gcc, -W -cstrict)	30s
linux / build-examples (clang)	26s
linux / build-examples (clang, -W -cstrict)	23s
linux / lint / fmt	3s
linux / lint / vet	3s
macos / build-examples (clang)	13s
macos / build-examples (clang, -W -cstrict)	13s
windows / build-examples (gcc)	1m 35s
windows / build-examples (gcc, -W -cstrict)	1m 40s
	9m 20s

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