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?
