BlockWalker: Handle Store.guard. #484

Job	Run time
windows / Test Windows	26s
macos / Test macOS	27s
ci / Build	3m 46s
ci / Lint	56s
ci / Test (0)	5m 35s
ci / Test (1)	6m 27s
ci / Test (2)	7m 32s
ci / Test (3)	6m 22s
ci / Test (4)	6m 17s
ci / Test (5)	4m 22s
ci / Test (6)	8m 38s
ci / Test (7)	5m 6s
ci / Test (8)	7m 47s
ci / Test (9)	4m 48s
ci / Publish Unit Tests Results	1s
	1h 8m 30s

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