# File lib/vcr/cassette/serializers.rb, line 21
      def [](name)
        @serializers.fetch(name) do |_|
          @serializers[name] = case name
            when :yaml        then YAML
            when :syck        then Syck
            when :psych       then Psych
            when :json        then JSON
            when :compressed  then Compressed
            else raise ArgumentError.new("The requested VCR cassette serializer (#{name.inspect}) is not registered.")
          end
        end
      end