Add the missing size attribute to V256. #559

Job	Run time
macos / Test macOS	1m 19s
ci / Build	3m 28s
windows / Test Windows	2m 24s
ci / Lint	53s
ci / Test (0)	8m 15s
ci / Test (1)	8m 59s
ci / Test (2)	5m 47s
ci / Test (3)	5m 11s
ci / Test (4)	5m 23s
ci / Test (5)	9m 3s
ci / Test (6)	8m 17s
ci / Test (7)	8m 27s
ci / Test (8)	5m 8s
ci / Test (9)	6m 39s
ci / Publish Unit Tests Results	1s
	1h 19m 14s

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