fix: only consider unique expected keys in keys() #1762
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Fixes #1705. Basically there's a bug where `{ a: 5, b: 6}` and `keys(['a', 'a'])` will pass because we're incorrectly assuming the key count equalling the actual key count must mean it has all of them. This fixes it by using a `Set` (widely available since node 0.x).
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Fixes #1705.
Basically there's a bug where
{ a: 5, b: 6}andkeys(['a', 'a'])will pass because we're incorrectly assuming the key count equalling the
actual key count must mean it has all of them.
This fixes it by using a
Set(widely available since node 0.x).