mapはHashではなくArrayを返す.(当たり前だけど)
h = {"a"=> 1, "b"=>2}
h.map{|k, v| [k.upcase. v] } => [["A", 1], ["B", 2]]
hがHashだとわかっているならこういうコードが手っ取り早い.
Hash[h.map{|k, v| k = k.upcase; [k, v] }]
=> {"A"=>1, "B"=>2}
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