The default value of "attrForSelected" in "paper-radio-group" causes troubles in iron-form.serialize()

[zaclummys]

Description

iron-form doesn't serialize paper-radio-group correctly, since the default value to attrForSelected is name and to paper-radio-group says that you need to change this attribute for all its children.

Why?

The function serialize uses name attribute as its key. But paper-radio-group's children must have the same key for all its children. If not, which would be the point to use them in group?

How it'd be

Changing attrForSelected: { type: String, value: 'name' } to attrForSelected: { type: String, value: 'value' }, then serialize won't return {"letter-a": "on"}, it'll {"letter": "letter-a"}

Example

<paper-radio-group selected="letter-a">
    <paper-radio-button name="letter" value="letter-a">a</paper-radio-button>
    <paper-radio-button name="letter" value="letter-b">b</paper-radio-button>
    <paper-radio-button name="letter" value="letter-c">c</paper-radio-button>
</paper-radio-group>

Unfortunately, it's necessary repeating name attribute in the elements of same group.