message: [Storage] Remove Deref implementation for Nibble
  It is not used anywhere.
diff: @@ -9,7 +9,7 @@ mod nibble_path_test;
  use crate::ROOT_NIBBLE_HEIGHT;
  use proptest::{collection::vec, prelude::*};
  use serde::{Deserialize, Serialize};
  -use std::{fmt, iter::FromIterator, ops::Deref};
  +use std::{fmt, iter::FromIterator};
  #[derive(Clone, Copy, Debug, Hash, Eq, PartialEq, Serialize, Deserialize)]
  pub struct Nibble(u8);
  @@ -35,13 +35,6 @@ impl fmt::LowerHex for Nibble {
  }
  }
  -impl Deref for Nibble {
  - type Target = u8;
  - fn deref(&self) -> &Self::Target {
  - &self.0
  - }
  -}
  -
  impl Arbitrary for Nibble {
  type Parameters = ();
  type Strategy = BoxedStrategy<Self>;
  