diff --git a/changeset/Cargo.toml b/changeset/Cargo.toml
index 0e02630..450fd56 100644
--- a/changeset/Cargo.toml
+++ b/changeset/Cargo.toml
@@ -3,7 +3,6 @@ name = "changeset"
 version = "0.1.0"
 edition = "2021"
 license = "GPL-3.0-only"
-license-file = "../COPYING"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
diff --git a/changeset/src/lib.rs b/changeset/src/lib.rs
index 40a0666..4173ad7 100644
--- a/changeset/src/lib.rs
+++ b/changeset/src/lib.rs
@@ -26,7 +26,7 @@ pub enum Change<Key: Eq + Hash, Value> {
     NewRecord(Value),
 }
 
-#[derive(Clone, Debug)]
+#[derive(Clone, Debug, Default)]
 pub struct Changeset<Key: Clone + Eq + Hash, Value> {
     delete: HashSet<Key>,
     update: HashMap<Key, Value>,
@@ -34,14 +34,6 @@ pub struct Changeset<Key: Clone + Eq + Hash, Value> {
 }
 
 impl<Key: Clone + Constructable + Eq + Hash, Value> Changeset<Key, Value> {
-    pub fn new() -> Self {
-        Self {
-            delete: HashSet::new(),
-            update: HashMap::new(),
-            new: HashMap::new(),
-        }
-    }
-
     pub fn add(&mut self, r: Value) -> Key {
         let k = Key::new();
         self.new.insert(k.clone(), r);
@@ -90,7 +82,7 @@ impl<Key: Clone + Eq + Hash, Value> From<Changeset<Key, Value>> for Vec<Change<K
                     .into_iter()
                     .map(|(k, v)| Change::UpdateRecord((k, v))),
             )
-            .chain(new.into_iter().map(|(_, v)| Change::NewRecord(v)))
+            .chain(new.into_values().map(|v| Change::NewRecord(v)))
             .collect()
     }
 }
@@ -100,7 +92,7 @@ mod tests {
     use super::*;
     use uuid::Uuid;
 
-    #[derive(Clone, PartialEq, Eq, Hash)]
+    #[derive(Clone, PartialEq, Eq, Hash, Default)]
     struct Id(Uuid);
     impl Constructable for Id {
         fn new() -> Self {
@@ -110,7 +102,7 @@ mod tests {
 
     #[test]
     fn it_generates_a_new_record() {
-        let mut set: Changeset<Id, String> = Changeset::new();
+        let mut set: Changeset<Id, String> = Changeset::default();
         set.add("efgh".to_string());
         let changes = Vec::from(set.clone());
         assert_eq!(changes.len(), 1);
@@ -125,7 +117,7 @@ mod tests {
 
     #[test]
     fn it_generates_a_delete_record() {
-        let mut set: Changeset<Id, String> = Changeset::new();
+        let mut set: Changeset<Id, String> = Changeset::default();
         let id1 = Id::new();
         set.delete(id1.clone());
         let changes = Vec::from(set.clone());
@@ -142,7 +134,7 @@ mod tests {
 
     #[test]
     fn update_unrelated_records() {
-        let mut set: Changeset<Id, String> = Changeset::new();
+        let mut set: Changeset<Id, String> = Changeset::default();
         let id1 = Id::new();
         let id2 = Id::new();
         set.update(id1.clone(), "abcd".to_owned());
@@ -155,7 +147,7 @@ mod tests {
 
     #[test]
     fn delete_cancels_new() {
-        let mut set: Changeset<Id, String> = Changeset::new();
+        let mut set: Changeset<Id, String> = Changeset::default();
         let key = set.add("efgh".to_string());
         set.delete(key);
         let changes = Vec::from(set);
@@ -164,7 +156,7 @@ mod tests {
 
     #[test]
     fn delete_cancels_update() {
-        let mut set: Changeset<Id, String> = Changeset::new();
+        let mut set: Changeset<Id, String> = Changeset::default();
         let id = Id::new();
         set.update(id.clone(), "efgh".to_owned());
         set.delete(id.clone());
@@ -175,7 +167,7 @@ mod tests {
 
     #[test]
     fn update_atop_new_is_new() {
-        let mut set: Changeset<Id, String> = Changeset::new();
+        let mut set: Changeset<Id, String> = Changeset::default();
         let key = set.add("efgh".to_owned());
         set.update(key, "wxyz".to_owned());
         let changes = Vec::from(set);
@@ -185,7 +177,7 @@ mod tests {
 
     #[test]
     fn updates_get_squashed() {
-        let mut set: Changeset<Id, String> = Changeset::new();
+        let mut set: Changeset<Id, String> = Changeset::default();
         let id1 = Id::new();
         let id2 = Id::new();
         set.update(id1.clone(), "efgh".to_owned());