In a previous iteration of Notion used a kind of model kinda like ECS, where each block was represented by multiple records called "reference" and "composite",

In a previous iteration of Notion used a kind of model kinda like ECS, where each block was represented by multiple records called "reference" and "composite", so a block could have different type depending on context. From an internal doc on history: > We later decided this wasn't useful or necessary and collapsed them into one thing. WTF was I thinking??