fix(queries): Unmarshall cached Datastore Keys in query's read()

[sebelga]

2

[coveralls]

Pull Request Test Coverage Report for Build 11

• 1 of 1 (100.0%) changed or added relevant line in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.04%) to 98.94%

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Totals
Change from base Build 9:	-0.04%
Covered Lines:	190
Relevant Lines:	191

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💛 - Coveralls