Null coalescing operator

I have a couple of points about the null coalescing operator, `??`.

Firstly, why isn't it still `||` like vanilla JS and the rest of the programming languages[1]?
Changing it just for the sake of change just introduces confusion is not an improvement, IMHO.

Secondly, the ruby-esque `||=` operator would be amazing.

```
a ||= b
```

becomes

```
a = a || b
```

_(this can be `??=` if you're quite set on keeping the `??`)_

[1] Except the unruly PHP