Add support for Backed Enums #634

Job	Run time
Tests (windows-latest, 7.2, default)	42s
Tests (ubuntu-latest, 8.1, default)	1m 20s
Tests (windows-latest, 8.1, default)	1m 51s
Tests (windows-latest, 8.4, default)	1m 56s
Tests (ubuntu-latest, 7.4, default)	13s
Tests (ubuntu-latest, 8.0, default)	13s
Tests (ubuntu-latest, 7.2, default)	13s
Tests (windows-latest, 8.5, default)	1m 54s
Tests (ubuntu-latest, 8.3, default)	1m 19s
Tests (windows-latest, 7.4, default)	45s
Tests (windows-latest, 8.0, default)	1m 28s
Tests (ubuntu-latest, 8.5, default)	1m 19s
Tests (ubuntu-latest, 8.2, default)	1m 18s
Tests (ubuntu-latest, 8.4, default)	1m 18s
Tests (windows-latest, 8.3, default)	1m 49s
Tests (windows-latest, 8.2, default)	1m 59s
Tests (windows-latest, 7.3, default)	45s
Tests (ubuntu-latest, 7.3, default)	11s
	20m 33s

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