Set-only accessors spread to undefined#28213
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Previously they were skipped. The runtime behaviour is to create a
property of type undefined, unlike (for example) spreading numbers or
other primitives. So now spreading a set-only accessor creates a
property of type undefined:
```ts
const o: { foo: undefined } = { ...{ set foo(v: number) { } } }
```
Notably, `o.foo: undefined` not `number`.
Fixes #26337
ghost
approved these changes
Oct 29, 2018
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Previously they were skipped. The runtime behaviour is to create a property of type undefined, unlike (for example) spreading numbers or other primitives, which are skipped. So now spreading a set-only accessor creates a property of type undefined:
Notably,
o.foo: undefinednotnumber.Fixes #26337