Fix enum idempotency #661

Job	Run time
spec (ruby 3.2 \| puppet ~> 8.0) / spec	1m 33s
spec (ruby 2.7 \| puppet ~> 7.0) / spec	1m 48s
acceptance (windows-latest ruby 2.7 \| puppet ~> 7.0) / acceptance	7m 26s
acceptance (windows-latest ruby 3.2 \| puppet ~> 8.0) / acceptance	8m 59s
	19m 46s

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