メモ。Ruby 1.9 なら標準で、1.8.7 環境なら active_support で。
require 'active_support/core_ext/enumerable'
で。
{:foo => '1', :bar => '2'}.each_with_object({}) {|(key, value), object|
object[key] = value.to_i
}
# => {:foo=>1, :bar=>2}
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