Don't whack me please :'D I think I found another small bug.

setObject seems to handle FormArrays and FormGroups differently:

• For FormGroups, patched values will be replaced by new values.
• For FormArrays, new values will be ADDED to patched values.

So let's assume we have a Dynamic FormGroup set up with data like this:

{
  name:'foo',
  attachments:[
    {name:'test',file:'path'},
    {name:'stuff',file:'path2'}
  ]
}

And then run

formGroup.setObject({
  name:'bar',
  attachments:[
    {name:'changed',file:'newpath'},
    {name:'stuff',file:'path2'}
  ]
})

the form value will become

{
  name:'bar',
  attachments:[
    {name:'test',file:'path'},
    {name:'stuff',file:'path2'},
    {name:'changed',file:'newpath'},
    {name:'stuff',file:'path2'}
  ]
}

the naming setObject indicates the whole form value will be replaced, in opposite to something like patchObject.
So I think the current behavior is inconsistent and existing FormArray items should be cleared before adding new controls.