QML formatter breaks signal handlers written in "arrow function expression"

import QtQuick

Item {
    onDataChanged: (data) => { // Notice the "(data) =>" arrow function expression
        if (someCondition)
            console.log("function called")
        doSomethingElse()
    }
}

import QtQuick

Item {
    onDataChanged: function (data) {
        if (someCondition)
            console.log("condition matched")
        doSomethingElseWithData(data)
    }
}