Re: [heycam/webidl] Enums that does not throw? (#893)

Sure, @annevk: The bug was https://bugzilla.mozilla.org/show_bug.cgi?id=1573245 for the webcompat issue with Chrome. When they added the enum type and began using it, Gecko threw `Uncaught (in promise) TypeError: CredentialsContainer.get: 'cable' (value of 'transports' member of PublicKeyCredentialDescriptor) is not a valid value for enumeration AuthenticatorTransport.` while parsing the scripts.

All uses of WebAuthn are through passing dictionaries to the methods `navigator.credentials.get` or `navigator.credentials.create`, which presumably is why they throw.

It sounds like it would have been more future-proof if Credentials Management had instead returned an interface which could have been manipulated with setters, and had some sort of execute method.

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