Why ES6 introduced classes yet `Symbol` not to be used with `new`?

[/#!/JoePea]

It seems like `new Symbol()` would be inline with the introduction of
classes. Why was it chosen not to be constructible? Seems like it would
make sense to throw an error on `Symbol()` but not `new Symbol()`. Was it
to save three characters of typing?

*/#!/*JoePea
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