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Each item type (ex. article or product) have their own feed and entity.id position.
For example, feed A for "Article" item type with pre-fix like "article-12345" in entity.id field.
And another feed B for "Product" item type with pre-fix like "prod-12345" in the entity.id field.
That means there is no duplicated identity data in entity field. Then when you can create a Criteria, you can use "Filter" setting to limit learning scope for "article" or "product".
That's what I know the product logic and practice.