Similarly to
```js
const { x = 'a' } = {}; // z === 'a'
const { y = 'a' } = { y: undefined }; // z === 'a'
const { z = 'a' } = { z: null }; // z === null
```
I'd like to propose
```js
const { x =? 'a' } = {}; // z === 'a'
const { y =? 'a' } = { y: undefined }; // z === 'a'
const { z =? 'a' } = { z: null }; // z === 'a'
```
Which would handle also null values in default cases
This is because default destructuring introduced in ES6 doesn't handle null
values, null values in JSON are quite common from APIs, it'd be convenient
It's also inspired by the null-coalescing operator
https://github.com/tc39/proposal-nullish-coalescing
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