Make enums serialize as strings if using the reflection-based seriali… #441

Job	Run time
build (ubuntu-latest, Debug)	3m 33s
build (ubuntu-latest, Release)	3m 10s
build (macos-latest, Debug)	2m 17s
build (windows-latest, Debug)	5m 53s
build (windows-latest, Release)	4m 30s
build (macos-latest, Release)	6h 5m 0s
publish-coverage	-1s
	6h 24m 22s

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