message: Actually add `base` to estimate object size in `DataSize` implementation of `ObjectPool`
diff: @@ -68,14 +68,15 @@ impl DataSize for ObjectPool<Box<[u8]>> {
  + mem::size_of::<Weak<[u8]>>()
  + mem::size_of::<usize>());
  - self.items
  + base + self
  + .items
  .iter()
  .map(|(key, value)| {
  // Unfortunately we have to check every instance by upgrading.
  let value_size = value.upgrade().map(|v| v.len()).unwrap_or_default();
  key.len() + value_size
  })
  - .sum()
  + .sum::<usize>()
  }
  }
  