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Interesting. This is not my idea of a map, then. If you have two
identical keys, does a lookup always find the same one? Or can it
sometimes find one but sometimes find the other? Or do you get both
values back on the same operation?
On a "get", by default you get the first one, but you can choose to get the
last one if you want.
Of course, you can iterate over all dup keys, starting with the first one
(setll), or the last one.(setgt).
The keys are mutable ifd they're maps, thats true.
Once inserted into the map, you shouldn't mutate the keys, of course.
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