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: argument.rb
    path of file: ./repos/graphql-ruby/lib/graphql/schema
    
    the code of the file until where you have to start completion: # frozen_string_literal: true
module GraphQL
  class Schema
    class Argument
      include GraphQL::Schema::Member::HasPath
      include GraphQL::Schema::Member::HasAstNode
      include GraphQL::Schema::Member::HasDirectives
      include GraphQL::Schema::Member::HasDeprecationReason
      include GraphQL::Schema::Member::HasValidators
      include GraphQL::EmptyObjects

      # @return [String] the GraphQL name for this argument, camelized unless `camelize: false` is provided
      attr_reader :name
      alias :graphql_name :name

      # @return [GraphQL::Schema::Field, Class] The field or 
    
      def validate_default_value
        coerced_default_value = begin
          # This is weird, but we should accept single-item default values for list-type arguments.
          # If we used `coerce_isolated_input` below, it would do this for us, but it's not really
          # the right thing here because we expect default values in application format (Ruby values)
          # not GraphQL format (scalar values).
          #
          # But I don't think Schema::List#coerce_result should apply wrapping to single-item lists.
          prepped_default_value = if default_value.nil?
            nil
          elsif (type.kind.list? || (type.kind.non_null? && type.of_type.list?)) && !default_value.respond_to?(:map)
            [default_value]
          else
            default_value
          end

          type.coerce_isolated_result(prepped_default_value) unless prepped_default_value.nil?
        rescue GraphQL::Schema::Enum::UnresolvedValueError
          # It raises this, which is helpful at runtime, but not here...
          default_value
        end
        res = type.valid_isolated_input?(coerced_default_value)
        if !res
          raise InvalidDefaultValueError.new(self)
        end