You have to be careful with using Array() to transform a non-array into an array. Suppose for example you wanted an array of hashes:

  >> Array([{:a => "b"}])
  => [{:a=>"b"}]
  >> Array({:a => "b"})
  => [[:a, "b"]]

It doesn't work as you might expect with a Hash. I'd probably recommend sticking with something like either of these unless you know you aren't going to be getting a Hash:

  a = [a] unless a.is_a?(Array) # option 1
  a = [*a]                      # option 2