code: function Collision(edit, hash, children) {
      return {
          type: COLLISION,
          edit: edit,
          hash: hash,
          children: children,
          _modify: Collision__modify
      };
  }
docs: Leaf holding multiple values with the same hash but different keys.
  
  @member edit Edit of the node.
  @member hash Hash of key.
  @member children Array of collision children node.