code: func (f CodecFactory) SerializerForFileExtension(extension string) (runtime.Serializer, bool) {
  	for _, s := range f.serializers {
  		for _, ext := range s.FileExtensions {
  			if extension == ext {
  				return s.Serializer, true
  			}
  		}
  	}
  	return nil, false
  }
docs: // SerializerForFileExtension returns a serializer for the provided extension, or false if no serializer matches.