# Hook to customize the deserialization of MessagePack extensions
	#
	# Redefine this method in subclasses to return custom Nit objects from
	# an application specific extension.
	#
	# This method is invoked before dealing with the extensions used by the
	# Nit serialization metadata [0x40..0x43]. In general, you should ignore
	# them by returning `null`, but they can also be intercepted to comply to
	# a format from a remote server.
	protected fun deserialize_ext(ext: MsgPackExt, static_type: nullable String): nullable Object
	do
		return null
	end