Why does tageditor return a string?

[bharal]

Can we have tageditor return an array instead, in the same way that the autocomplete accepts an array of label/value objects?

[tazoony]

Since TagEditor is based on a textaerea, I guess it only can return a string.
I think it's the best way to make a great tag input form because you can type new unexisting tags directly in the input.