Not sure if this has been proposed, discussed, and soundly rejected before,
but I wasn't able to find any mention of it in the archives.
Let's say I'm using Array.prototype.reduce with an initialValue to convert
an array into an object, like this:
```javascript
[0,1,2,3,4].reduce((result, val) => {
let key = val % 2 ? "even" : "odd";
return {...result, [key]: val};
}, {})
```
The problem with that is it takes you all the way to the end of the
function to find out what the initial value of `result` is (in this case,
an object). This is bad for code readability.
Now that ES2015 has introduced default arguments, it would make a lot more
sense if I could say:
```javascript
array.reduce( (result = {}, val) => {} )
```
I know this presents a backwards-compatibility issue. Is that surmountable?
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