[AC-6273] Applying borderRadius to a view creates a sort of buffer between it and its child

var win = Ti.UI.createWindow({
    backgroundColor: 'black',
});

var vw_main = Ti.UI.createView({
    left: 0,
    top: 0,
    width: '100%',
    height: '100%',
});
win.add(vw_main);

var vw_rect1 = Ti.UI.createView({
    //top: 20,
    width: 250,
    height: 100,
    borderRadius: 10,
    backgroundColor: 'red',
});
vw_main.add(vw_rect1);

var vw_rect2 = Ti.UI.createView({
    width: 250,
    height: 100,
    backgroundColor: 'black',
});
vw_rect1.add(vw_rect2);

/*
When borderRadius is enabled in the red view. It is shrinking its child view by (what i assume is 1px).
This causes a unwanted thin border.
*/

win.open();