Fix enum serialization #134

Job	Run time
build (ubuntu-latest, Release)	2m 36s
build (macos-latest, Release)	1m 52s
build (ubuntu-latest, Debug)	3m 56s
build (windows-latest, Release)	3m 43s
build (windows-latest, Debug)	4m 7s
build (macos-latest, Debug)	1m 50s
	18m 4s

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