[RFC 6838 4.3](https://datatracker.ietf.org/doc/html/rfc6838#section-4.3) notes that duplicate parameter names in MIME types should be treated as errors. We should reject such cases when parsing MIME types.
RFC 6838 4.3 notes that duplicate parameter names in MIME types should be treated as errors. We should reject such cases when parsing MIME types.