JSTests/ChakraCore/test/TTBasic/arrayRecord.baseline

Array.isArray(x): true
x.length: 3
x === y: true
x.baz: 5
x[0]: 3
y[1]: null
x[5]: undefined
post update -- y[1]: non-null
post update -- x[5] !== null: true
post update -- x[5].bar: 3
post update -- y[6]: 10