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raise(SmartCore::Initializer::ThyTypeValidationError, <<~ERROR_MESSAGE)
  Incorrect type of #{attribute.name.inspect} attribute for #{instance.class}
  Expected: #{type.inspect}, but got: #{value.inspect}
ERROR_MESSAGE

class Model
  include SmartCore::Initializer

  def self.column(...)
    option(...)
  end
end

class Author < Model
  column :id, Types::Integer, metadata: { primary_key: true }
  column :name, Types::String, metadata: { unique: true }
end

class Book < Model
  column :author, Types::Integer, metadata: { foreign_key: Author }
  column :title, Types::String
end

class CoveredBook < Book
  column :cover, Types::Base64Image
end

> Proc.new{|obj|obj.x}.arity
=> 1
> Proc.new(&:x).arity
=> -2

> class A < SmartCore::Operation; param :text, finalize: Proc.new{|obj|obj.x}; end
=> nil
> class A < SmartCore::Operation; param :text, finalize: proc(&:x); end
/home/.rbenv/versions/3.0.2/lib/ruby/gems/3.0.0/gems/smart_initializer-0.9.0/lib/smart_core/initializer/attribute/factory/base.rb:95:in `prepare_finalize_param': Lambda-based finalizer should have arity equal to 1 or equal to -1 (your lambda object should require one attribute) (SmartCore::Initializer::ArgumentError)

param :example, Types::InstanceOf(Example)

instance_double(Example)