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I might be interpreting jakes message incorrectly.

"the only correct cache header to send for images is `immutable` " and "seems like they're simply ignoring HTTP cache headers entirely and assuming everything can be cached forever. not sure that's a smart idea." seem at odds with each other? Or are you basically saying jake that images should be immutable, but its not a good idea (for an image loading library) to assume that every image will be?