Derive Macro NewTypeKey 

#[derive(NewTypeKey)]

Auto generate the required impls to use a newtype as a key

Example

use cw_storage_plus::NewTypeKey;
use serde::{Serialize, Deserialize};

#[derive(Serialize, Deserialize, Clone, Debug, PartialEq)]
#[derive(NewTypeKey)] // <- Add this line right here.
struct TestKey(u64);

// You can now use `TestKey` as a key in `Map`