> Why would  [NSArray initWithArray:copyItems:] be calling release on any
> object?

When that method copies the objects in the supplied array, the copies
start with a retain count of 1. Then, when each of these copies are
placed into the new array, their retain count becomes 2.
-initWithArray:copyItems then releases each of the copied objects once
so that the array becomes the sole owner of them. (If it didn't do
this, the copied objects would never get released, even when the
resulting array is released.)
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