feat(next): keep original string on unknown variants #1104

Job	Run time
Check Examples	45s
format	16s
clippy (default-tls)	1m 9s
Docs	1m 10s
clippy (rustls-tls-webpki-roots)	1m 5s
Stripe Mock Tests (default-tls)	1m 30s
clippy (rustls-tls-native)	1m 7s
Test Clients (default-tls)	1m 49s
verify-codegen-crate	2m 3s
clippy (async-std-surf)	1m 12s
Stripe Mock Tests (rustls-tls-webpki-roots)	1m 35s
Test Clients (rustls-tls-webpki-roots)	1m 55s
Stripe Mock Tests (rustls-tls-native)	1m 34s
Test Clients (rustls-tls-native)	1m 44s
Test Clients (async-std-surf)	2m 2s
	20m 56s

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