Union
A discriminated union: the tag (taggedBy's primitive) is read first, then exactly the matching Variant's fields. An unrecognized tag is a loud UnknownTag error — never skipped, never defaulted.
- Subclass Of
Wire Form, 
Declaration
A discriminated union: the tag (taggedBy's primitive) is read first, then exactly the matching Variant's fields. An unrecognized tag is a loud UnknownTag error — never skipped, never defaulted.
Wire Form, Declaration
