> Well, except that count and empty are broken for some reason:
>
> user=> (.count (Bag. {} 0))
> 0
> user=> (count (Bag. {} 0))
> 1
>
> I don't understand what's causing this, but empty bags are always
> returning a count of 1 (and false from empty?) although the .count
> method correctly returns zero. I've traced the problem as far as the
> Java method clojure.lang.RT/count but no farther at this time.

Argh. This same bug causes union to blow up in the case of (union (bag
1) (bag)). It works with (union #{1} #{}), by contrast. It traces back
to empty? wrongly returning true, and thus to count wrongly returning
1 even though .count correctly returns 0.

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