I propose that initialize values in `becomes` method

for example,

class Book < ApplicationRecord
end


class PaperBook < Book
  after_initialize do |boo|
    material ||= "paper"
  end
end


> book = Book.new
> book.material
# => nil


> book.becomes!(PaperBook).materal
# => "paper"

Shoul I implement the feature?
Does it make sense?

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