Use Symbols for Row properties, Object.create() without a PropertyMap instead of constructor calls#2

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trxcllnt wants to merge 2 commits intoTheNeuralBit:proxy-benchfrom

trxcllnt:js/proxy-bench-update

Commits on Feb 11, 2019

avoid Object.defineProperty-like calls outside the Row constructor
trxcllnt
committed
guard against redefining index properties in case columns have integer names
trxcllnt
committed