fix: Keeps Enum order when converting to R #3653

Job	Run time
macos-12 with pre-built binary (release)	10s
macos-14 (release)	9m 15s
macos-14 with pre-built binary (release)	9s
windows-latest (devel)	28m 57s
windows-latest with pre-built binary (oldrel-1)	10s
windows-latest (release)	30m 52s
windows-latest with pre-built binary (release)	10s
ubuntu-latest (devel)	11m 1s
windows-latest with pre-built binary (devel)	10s
ubuntu-latest (release)	10m 43s
ubuntu-latest with pre-built binary (oldrel-1)	3s
ubuntu-latest (oldrel-1)	10m 42s
ubuntu-latest with pre-built binary (release)	7s
macos-14 (release) full-features	8m 45s
ubuntu-latest with pre-built binary (devel)	7s
windows-latest (release) full-features	29m 39s
ubuntu-latest (release) full-features	10m 58s
	2h 31m 58s

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