# Should strings declaring the objects type and attributes name be cached?
	#
	# If `true` metadata strings are cached using `cache`.
	# The first occurrence is written as an object declaration,
	# successive occurrences are written as an object reference.
	#
	# If `false`, the default, metadata strings are written as pure MessagePack
	# strings, without their own metadata.
	#
	# Using the cache may save some space by avoiding the repetition of
	# names used by many types or attributes.
	# However, it adds complexity to the generated message and may be less
	# safe for versioning.
	var cache_metadata_strings = false is writable