You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: builder.rb
    path of file: ./repos/steep/lib/steep/interface
    
    the code of the file until where you have to start completion: module Steep
  module Interface
    class Builder
      class Config
        attr_reader 
    
      def raw_object_shape(type, public_only, subst)
        cache =
          case type
          when AST::Types::Name::Instance
            raw_instance_object_shape_cache
          when AST::Types::Name::Interface
            raw_interface_object_shape_cache
          when AST::Types::Name::Singleton
            raw_singleton_object_shape_cache
          end