Why two default export styles?

[Alice Bellard]

In 16.3.2.2.1:

16.3.2.2.1 Why two default export styles?

The second default export style was introduced because variable declarations can’t be meaningfully turned into default exports if they declare multiple variables:

export default const foo = 1, bar = 2, baz = 3; // not legal JavaScript!

Which one of the three variables foo, bar and baz would be the default export?

So, you are saying the second export style was introduced so that we can do:

const foo = 1, bar = 2 , baz = 3;
export default foo;

Right? But I don't see how that can be an improvement over this one:

export default const foo = 1;
const bar = 2, baz = 3;

It's same two lines of code.

[Raul-Sebastian Mihăilă]

If you were to support 

export default const foo = 1;

you'd normally support

export default const foo = 1, bar = 2;

as well. Because it wouldn't make much sense to allow

const foo = 1, bar = 2;

but not

export default const foo = 1, bar = 2;

But you cannot allow

export default const foo = 1, bar = 2;

because only one thing can be exported as a default export.