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#1540 — 8.4.5: Integer indexed exotic objects need override additional internal methods


Browsers also support [[GetOwnProperty]] etc. for integer indexed objects (which means Typed Arrays):

For example:
- `Object.getOwnPropertyDescriptor(new Int8Array(1), "0")` should return a property descriptor, but currently returns `undefined`.
- `"0" in new Int8Array(1)` should yield `true`, but currently yields `false`


everything necessary except for [[Enumberate]] and [[OwnPropertyKeys]] now in rev 16 editor's working draft.


fixed in rev24 editor's draft


fixed in rev24