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Test scripts are here...
Just to add, my expected output for reftest-array.php is:
arrTheArray = Array
 => xx1
 => xx2
 => xx3
 => xx4
 => xx5
Neither PHP5.2 or PHP5.0.4 completely succeed.
Got some more isolation info on 5.1.x
the bug first appeared in 5.1.2 and is present in all 5.1 & 5.2 releases since then.
Fixed in CVS HEAD and PHP_5_2