Material-ui: [Checkbox] How to add a custom attribute?

[wzup]

How can I add a custom attribute and get its value within onCheck handler?

Example:

<Checkbox
    label={this.props.label}
    onCheck={this.onCheck}
    checked={this.props.checked}
    labelStyle={{width: 'initial'}}
    data-my-custom-attribute="FOO" // the attribute
/>

onCheck(e, checked) {

    //  How to get the attribute here?
    let foo = e.target.getAttribute('data-my-custom-attribute'); // foo === "FOO"
}

[mbrookes]

https://github.com/callemall/material-ui/blob/master/CONTRIBUTING.md#asking-questions

[steowens]

This has to be the worst handling of an issue ever. Gotta remember this guy cause I don't want him on my team.