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2bfd919b6a
* Narrow literal element accesses
This means that, for example, the tuple `[number, string?]` allows its
second element to be narrowed with element access:
```ts
export function f(pair: [number, string?]): string {
return pair[1] ? pair[1] : 'nope';
}
```
* Update baselines
* Cleanup
* More cleanup
* Test dashes in property names
* More cleanup
* Delete undead code