build

make sure the new MultiField constructor in actually unit-tested for … #1557

Job	Run time
ci (Release, linux gnu-10)	19m 34s
ci (Release, linux gnu-12)	19m 8s
ci (Release, linux gnu-14)	18m 39s
ci (Release, linux clang-13)	18m 37s
ci (Release, linux clang-18)	18m 49s
ci (Release, linux intel)	11m 48s
ci (Release, linux intel-classic)	21m 23s
ci (Release, linux nvhpc-25.1)	25m 31s
ci (Release, macos)	10m 29s
ci (Debug, linux gnu-10)	25m 14s
ci (Debug, linux gnu-12)	18m 54s
ci (Debug, linux gnu-14)	18m 11s
ci (Debug, linux clang-13)	17m 39s
ci (Debug, linux clang-18)	18m 30s
ci (Debug, linux intel)	11m 17s
ci (Debug, linux intel-classic)	21m 6s
ci (Debug, linux nvhpc-25.1)	19m 50s
ci (Debug, macos)	10m 26s
	5h 25m 5s

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