...
Preferred shares are of a different type rather than share class. Different classes of shares have distinct identifiers, including a different ticker symbol. Our Google (Alphabet) class A and class C shares in our examples show this - their FIGIs are different, and it is possible that they have a different ISIN / CUSIP in the U.S.
The new property was added under SEC-139, and we also added it to the Alphabet shares in examples to show users how to add the share class, as needed.