VirtualVariable: Add some accessors for type safety. #526

Job	Run time
ci / Build	3m 56s
windows / Test Windows	51s
macos / Test macOS	27s
ci / Test (0)	5m 0s
ci / Typecheck	57s
ci / Lint	52s
ci / Test (1)	8m 18s
ci / Test (2)	3m 43s
ci / Test (3)	4m 15s
ci / Test (4)	5m 21s
ci / Test (5)	6m 46s
ci / Test (6)	8m 55s
ci / Test (7)	7m 28s
ci / Test (8)	6m 10s
ci / Test (9)	7m 19s
ci / Publish Unit Tests Results	1s
	1h 10m 19s

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