How to set cost on MemoryConfig? Does the totalCostLimit even work?

On 'MemoryStorage' class NSCache is created. How do I set the cost while adding the object? The totalCostLimit is passed to the NSCache eventually but since we cannot set the cost anywhere - will that serve any purpose?

Start by reading the MemoryStorage class and its NSCache setup, focusing on how totalCostLimit is passed and whether inserted objects receive a cost. Determine whether the current behavior supports cost-based eviction and what observable behavior would confirm that the limit works.

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