fix(next): enum serialization #1095

Job	Run time
format	16s
Docs	56s
clippy (default-tls)	1m 20s
Check Examples	37s
Stripe Mock Tests (default-tls)	1m 17s
Test Clients (default-tls)	1m 44s
clippy (rustls-tls-webpki-roots)	1m 20s
Stripe Mock Tests (rustls-tls-webpki-roots)	1m 23s
Test Clients (rustls-tls-webpki-roots)	1m 41s
clippy (rustls-tls-native)	1m 19s
Stripe Mock Tests (rustls-tls-native)	1m 19s
Test Clients (rustls-tls-native)	1m 47s
clippy (async-std-surf)	1m 44s
verify-codegen-crate	1m 46s
Test Clients (async-std-surf)	1m 59s
	20m 28s

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