Android: Border Radius once set on a view cannot be reset( i.e. set to 0)

var win = Ti.UI.createWindow({

    backgroundColor: 'black',

});

var vw_main = Ti.UI.createView({

    left: 0,

    top: 0,

    width: '100%',

    height: '100%',

    layout: 'vertical',

});

win.add(vw_main);

var vw_rect1 = Ti.UI.createView({

    top: 20,

    width: 200,

    height: 300,

    borderRadius: 20,

    backgroundColor: 'red',

});

vw_main.add(vw_rect1);

var checkBox = Ti.UI.createSwitch({

    top: 10,

    value: true,

    style: Titanium.UI.Android.SWITCH_STYLE_CHECKBOX,

    title: 'Border Radius is enabled',

});

vw_main.add(checkBox);

checkBox.addEventListener('change', function (e) {

    if (e.value) {

        vw_rect1.borderRadius = 20;

        checkBox.title = "Border Radius is enabled";

    }

    else {

        vw_rect1.borderRadius = 0;

        //vw_rect1.borderRadius = 0.1; //Current Workaround

        checkBox.title = "Border Radius is not enabled";

    }

});

win.open();