From a cursory look at the current Wurm Unlimited code, here is how it currently looks to me: Cedar slows down decay, but only of the item itself, not contents. Pottery amphoras still slow decay of contents. Decay slowdown bonuses still stack. The only current application of this is the "slowed decay of contents" rune. So for instance, you could have a runed satchel inside a runed raft inside a runed ship, I guess. Assuming you can put the rune on all those things.
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