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c650b1a9b0
Test of spec language from 15.4.4.4,
5.b.iii.3.b states 'Call the [[DefineOwnProeprty]] internal method of A'
which means that the result of Array.prototype.concat
should return `true` from `hasOwnProperty` for every property
created by `concat`, up to `length`
Set length to 3.
a[0] is set to 0 on a
a[1] is unset
a[2] is set to 2 via a prototype of a
add assertions for values of b[0], b[1], b[2]
add assertions for b.hasOwnProperty('2')
Check with Array.prototype and Object.prototype, separate tests
fix typo in assertion message
test was correct, but assertion message was incorrect