difference of cell arrays behavior between octave-3.0.5 and octave-3.4.2

[Sergei Steshenko]

In octave-3.0.5 I have:

"
octave:1> foo{1}(:) = []
foo =

{
  [1,1] = [](0x0)
}

octave:2> foo{2}(:) = [2;3]
foo =

{
  [1,1] = [](0x0)
  [1,2] =

     2   3

}

octave:3> 
".

In octave-3.4.2 I have:

"
foo{1}(:) = []
foo =
{
  [1,1] = [](0x0)
}
octave:2> foo{2}(:) = [2;3]
error: A(I) = X: X must have the same size as I
octave:2>
".


Why is it so that in octave-3.4.2 I have an error ?

Why at all size checking kicks in - "foo{2}(:)" doesn't yet have size,
it should be created according to RHS.

Which of the two behaviors is nominally correct (Matlab) ?

I've discovered this by running my code which works under octave-3.0.5
and which stopped working under octave-3.4.2.

Thanks,
  Sergei.