@CanIgnoreReturnValue
        public AttestationBuilder metadataIdentifier(
            @NonNull
            final Optional<String> metadataIdentifier) {
            return this.metadataIdentifier(metadataIdentifier.orElse(null));
        }
Free-form information about the authenticator model.
support/cas-server-support-webauthn-core/src/main/java/com/yubico/webauthn/attestation/Attestation.java