Setting array length to 0 discards reserved allocation?

[Andrew Godfrey via Digitalmars-d]

Going through other .dd files, I found an error in expression.dd.
It says "For static or dynamic arrays, identity is defined as 
referring
to the same array elements and the same number of elements."

Well, in fact:

unittest {
     // expression.dd says that equality AND IDENTITY compare 
elements and sizes, for both "static and dynamic arrays". Gaah!

     int[] a = new int[3];
     int[] b = new int[3];
     assert(a == b);
     assert(a !is b); // Nope! The doc is wrong!

     // So then:

     b = a;
     assert(b is a); // Now b points to a, and 'is' does what I'd 
expect.
     // But evidently it's because it compared the array 
references - not
     // the elements and sizes!
}

I would NOT recommend updating the compiler to match what the doc 
says.
The current behavior is consistent with how assignment to an 
array reference behaves.