fieldnames(foo) vs. for [v k]=foo

[Muhali]

Setting

octave> foo.b = pi ; foo.a = pi ;

one gets

octave> disp(fieldnames (foo))
{
  [1,1] = b
  [2,1] = a
}

but

octave> for [v k] = foo, disp(k), endfor 
a
b

So `for' uses lexicographic ordering while `fieldnames' uses assignment
order. Isn't that inconsequent, or at least somewhat confusing?
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