http://news.povray.org/povray.general/message/%3C5b540d5e%241%40news.povray.org%3E/#%3C5b540d5e%241%40news.povray.org%3
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#declare Foo = array;
This will create a resizable array with an initial size of zero, and
then grow the array...
So, it seems that ANY array is not resizable, only specially created arrays.