0.8: specifying custom attribute type does not work

[bughit]

In the following docs example :string turns into a key in the serialized hash
Specifying the type is seemingly pointless even if it worked, what's it for?

---

The type of a computed attribute (like :full_name above) is not easily calculated without some sophisticated static code analysis. To specify the type of a computed attribute:

class PersonSerializer < ActiveModel::Serializer
  attributes :first_name, :last_name, {:full_name => :string}

  def full_name
    "#{object.first_name} #{object.last_name}"
  end
end

[beauby]

Good question. @rails-api/ams anybody from the 0.8 era to answer this one?