Why does Hash#filter return an Array instead of a Hash? It isn't
really a filter if it's returning another data type.
Instead of
$H({'a':1,'b':2,'c':3,'d':4}).filter(function(i) { return i.value %
2; })
that returns,
[["a", 1], ["c", 3]]
I would expect it to return
{"a": 1, "c": 3}
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