The error in Slider.Value with stepSize and "snapMode: Slider.SnapAlways"

import QtQuick 2.9
import QtQuick.Controls 2.2
Item {
    id: root
    width: 700
    height: 700

    Slider {
        from: -7
        to: 7
        stepSize: 1
        snapMode: Slider.SnapAlways
        onValueChanged: console.log(value)
    }
}