Module Default Export Syntax

[Kevin Smith]

>
>
>     export default { a: a1, b: b1 };
>
>
To expand a bit:  these two export declarations are both valid:

    export { a, b, c };
    export default { a, b, c };

They differ only in the presence of a keyword, yet they are have completely
different semantics.

So let me propose an alternative to the current syntax that might be
acceptable to everyone:

    ExportDeclaration:
        ...
        export default ClassDeclaration
        export default FunctionDeclaration
        export default GeneratorDeclaration
        export default = AssignmentExpression

Thoughts?
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