Data Types

TSharedRef cannot be instantiated as a field with MakeShared. Not reliable.

UStructs are smaller than UObjects, but have some limitations

Don't work with interfaces
Don't work wtih TSubclassOf
Not garbage collected (must manage own references)
No blueprint callable functions
Not isntanced

https://dev.epicgames.com/community/learning/tutorials/oEn6/investigating-blueprint-data-loss-issues-in-unreal-engine#23memorylayout

https://medium.com/@wojtek.zinczuk/hey-guys-a14f5e770045

When should we use UObject vs UStruct vs plain old structs?
When to use UProperty vs TWeakobjectPtr vs TSharedPtr/Ref
#todo figure this out and document it