Replace boxed iterator with itertools::Either

Author: lann

Cargo.lock

@@ -11,3 +11,4 @@ warg-crypto = { workspace = true }
 serde = { workspace = true }
 serde_with = { workspace = true }
 thiserror = { workspace = true }
+itertools = { workspace = true }

crates/api/Cargo.toml

@@ -80,8 +80,8 @@ impl PackageRecord {
         match &self.state {
             PackageRecordState::Sourcing {
                 missing_content, ..
-            } => Box::new(missing_content.iter()) as Box<dyn Iterator<Item = _>>,
-            _ => Box::new(std::iter::empty()) as Box<dyn Iterator<Item = _>>,
+            } => itertools::Either::Left(missing_content.iter()),
+            _ => itertools::Either::Right(std::iter::empty()),
         }
     }
 }