clean

src/data.rs

 use bincode::{Decode, Encode};
 use itertools::{EitherOrBoth, Itertools};
 use serde::{Deserialize, Serialize};
-use std::{
-    collections::BTreeMap,
-    fmt::{Debug, Display},
-    sync::OnceLock,
-};
+use std::{collections::BTreeMap, fmt::Debug, sync::OnceLock};
 use string_interner::{StringInterner, Symbol, backend::StringBackend};
 
 #[derive(Serialize, Deserialize, Clone)]