Fix structured output backwards compatibility for string results #708

Job	Run time
build (ubuntu-latest, Debug)	4m 37s
build (windows-latest, Debug)	4m 33s
build (ubuntu-latest, Release)	4m 56s
build (windows-latest, Release)	4m 33s
build (macos-latest, Debug)	2m 22s
build (macos-latest, Release)	2m 15s
publish-coverage	0s
	23m 16s

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