Bug when saving structure array?

[michael . goffioul]

With a recent CVS (but it was also the case a few weeks ago), I observe
the following behavior:
 
> a.f1 = 10
a =
{
  f1 =  10
}
 
> a.f2(1) = struct('f21', 0, 'f22', 1);
> a.f2(2) = struct('f21', 2, 'f22', 3);
> size(a.f2)
ans =
   1   2
 
> save -binary mytest.bin a
> load -binary mytest.bin a
> size(a.f2)
ans =
   1   1
 
> a.f2
ans =
{
  f21 =
  {
    [1,1] = 0
    [1,2] =  2
  }
  f22 =
  {
    [1,1] =  1
    [1,2] =  3
  }
}

In summay, after saving and reloading, my structure array (a.f2) has
become a scalar structure whose fields are cell arrays. Is this a bug?
 
Michael.