Normalize Collection

Should I Normalize my Wix Collections, such as is done for other Database types when they are used in web applications?

From someone smarter than me:
Depends on the case. It is usually a good idea, but due to Wix’s reference implementation and performance implication it is sometimes justifiable to de-normalize - especially for composition relationships.

Thank you for your response.

Where can I learn more about WIX’s reference implementation?