message: Removing num_children from storage/jellyfish-merkle/src/node_type/mod.rs
  Closes:
  Approved by: bmwill
diff: @@ -334,11 +334,6 @@ impl InternalNode {
  self.children.get(&n)
  }
  - /// Return the total number of existing children.
  - pub fn num_children(&self) -> usize {
  - self.children.len()
  - }
  -
  /// Generates `existence_bitmap` and `leaf_bitmap` as a pair of `u16`s: child at index `i`
  /// exists if `existence_bitmap[i]` is set; child at index `i` is leaf node if
  /// `leaf_bitmap[i]` is set.
  