# Store `value` as a serialized Json string
	# java method according to value type
	# Returns `self` allowing fluent programming
	fun []=(name: String, value: nullable Serializable): Intent
	do
		var serialized_string = new StringWriter
		var serializer = new JsonSerializer(serialized_string)
		serializer.serialize(value)

		add_extra_string(name, serialized_string.to_s)
		return self
	end