Apparent problem with GC not collecting on Windows

[Michael]

> Because you used uint instead of ubyte, array is bigger, memory 
> exhausts faster.
Oh, I see.

>> 3. Why it helps?
>> GC.free(data.ptr);
>
> Initial leak happened because for some reason array allocated 
> in previous iteration was not collected by GC when allocating 
> new one, so the new one was allocated in another space growing 
> the heap. If you place GC.free the array gets removed from heap 
> on each iteration and each new allocation reuses the same 
> memory, heap doesn't grow.
If we do this manually it's works, but automatically is broken?