refactor(clippy): fix clippy warnings

src/core/event_engine/mod.rs

@@ -215,10 +215,10 @@ mod should {
             Transition {
                 invocations: self
                     .exit()
-                    .unwrap_or(vec![])
+                    .unwrap_or_default()
                     .into_iter()
-                    .chain(invocations.unwrap_or(vec![]))
-                    .chain(state.enter().unwrap_or(vec![]))
+                    .chain(invocations.unwrap_or_default())
+                    .chain(state.enter().unwrap_or_default())
                     .collect(),
                 state,
             }

src/dx/presence/event_engine/state.rs

@@ -367,10 +367,10 @@ impl State for PresenceState {
         Transition {
             invocations: self
                 .exit()
-                .unwrap_or(vec![])
+                .unwrap_or_default()
                 .into_iter()
-                .chain(invocations.unwrap_or(vec![]))
-                .chain(state.enter().unwrap_or(vec![]))
+                .chain(invocations.unwrap_or_default())
+                .chain(state.enter().unwrap_or_default())
                 .collect(),
             state,
         }

src/dx/subscribe/event_engine/effects/handshake.rs

@@ -15,8 +15,8 @@ pub(super) async fn execute(
 ) -> Vec<SubscribeEvent> {
     info!(
         "Handshake for\nchannels: {:?}\nchannel groups: {:?}",
-        input.channels().unwrap_or(Vec::new()),
-        input.channel_groups().unwrap_or(Vec::new())
+        input.channels().unwrap_or_default(),
+        input.channel_groups().unwrap_or_default()
     );
 
     if input.is_empty {

src/dx/subscribe/event_engine/effects/handshake_reconnection.rs

@@ -23,8 +23,8 @@ pub(super) async fn execute(
 
     info!(
         "Handshake reconnection for\nchannels: {:?}\nchannel groups: {:?}",
-        input.channels().unwrap_or(Vec::new()),
-        input.channel_groups().unwrap_or(Vec::new())
+        input.channels().unwrap_or_default(),
+        input.channel_groups().unwrap_or_default()
     );
 
     if input.is_empty {

src/dx/subscribe/event_engine/effects/receive.rs

@@ -22,8 +22,8 @@ pub(crate) async fn execute(
     info!(
         "Receive at {:?} for\nchannels: {:?}\nchannel groups: {:?}",
         cursor.timetoken,
-        input.channels().unwrap_or(Vec::new()),
-        input.channel_groups().unwrap_or(Vec::new())
+        input.channels().unwrap_or_default(),
+        input.channel_groups().unwrap_or_default()
     );
 
     if input.is_empty {

src/dx/subscribe/event_engine/effects/receive_reconnection.rs

@@ -30,8 +30,8 @@ pub(crate) async fn execute(
     info!(
         "Receive reconnection at {:?} for\nchannels: {:?}\nchannel groups: {:?}",
         cursor.timetoken,
-        input.channels().unwrap_or(Vec::new()),
-        input.channel_groups().unwrap_or(Vec::new())
+        input.channels().unwrap_or_default(),
+        input.channel_groups().unwrap_or_default()
     );
 
     if input.is_empty {

src/dx/subscribe/event_engine/state.rs

@@ -648,10 +648,10 @@ impl State for SubscribeState {
         Transition {
             invocations: self
                 .exit()
-                .unwrap_or(vec![])
+                .unwrap_or_default()
                 .into_iter()
-                .chain(invocations.unwrap_or(vec![]))
-                .chain(state.enter().unwrap_or(vec![]))
+                .chain(invocations.unwrap_or_default())
+                .chain(state.enter().unwrap_or_default())
                 .collect(),
             state,
         }