NHibernate Lazy=“Extra”

Question

Is there a good explanation out there on what exactly lazy=\"extra\" is capable of?

All the posts I\'ve seen all just repeat the fact that it turns references to

Answer 1

for version 2.x it is only used to translate a collection.Count() into a select count and as far as i can see in the source, it will also allow the construct collection[5] to fetch that particular entity (with index 5) instead of hydrating the whole collection.

For version 3.x i didn't see anything related in the release notes