--- a/crates/fleet-base/src/deploy.rs
+++ b/crates/fleet-base/src/deploy.rs
@@ -235,17 +235,12 @@
 					error!("failed to disarm rollback run: {e}");
 				}
 			}
-		} else {
-			match host
-				.rm_file("/etc/fleet_rollback_marker", true)
-				.in_current_span()
-				.await
-			{
-				Err(_e) => {
-					// Marker might not exist, yet better try to remove it.
-				}
-				_ => {}
-			}
+		} else if let Err(_e) = host
+			.rm_file("/etc/fleet_rollback_marker", true)
+			.in_current_span()
+			.await
+		{
+			// Marker might not exist, yet better try to remove it.
 		}
 	}
 	Ok(())
--- a/crates/fleet-base/src/host.rs
+++ b/crates/fleet-base/src/host.rs
@@ -214,13 +214,11 @@
 	pub fn set_session_destination(&self, dest: String) {
 		self.session_destination
 			.set(dest)
-			.ok()
 			.expect("session destination is already set")
 	}
 	pub fn set_deploy_kind(&self, kind: DeployKind) {
 		self.deploy_kind
 			.set(kind)
-			.ok()
 			.expect("deploy kind is already set");
 	}
 	pub async fn deploy_kind(&self) -> Result<DeployKind> {
@@ -568,6 +566,7 @@
 			local: true,
 			session: OnceLock::new(),
 			deploy_kind: OnceCell::new(),
+			session_destination: OnceCell::new(),
 		}
 	}
 
@@ -588,6 +587,7 @@
 			local: self.localhost == name,
 			session: OnceLock::new(),
 			deploy_kind: OnceCell::new(),
+			session_destination: OnceCell::new(),
 		})
 	}
 	pub async fn list_hosts(&self) -> Result<Vec<ConfigHost>> {
--- a/crates/fleet-shared/src/encoding.rs
+++ b/crates/fleet-shared/src/encoding.rs
@@ -51,10 +51,10 @@
 		};
 		let data = if let Some(unprefixed) = string.strip_prefix(BASE64_ENCODED_PREFIX) {
 			STANDARD_NO_PAD
-				.decode(unprefixed.replace(|v| matches!(v, '\n' | '\t' | ' '), ""))
+				.decode(unprefixed.replace(['\n', '\t', ' '], ""))
 				.map_err(|e| format!("base64-encoded failed: {e}"))?
 		} else if let Some(unprefixed) = string.strip_prefix(Z85_ENCODED_PREFIX) {
-			z85::decode(unprefixed.replace(|v| matches!(v, '\n' | '\t' | ' '), ""))
+			z85::decode(unprefixed.replace(['\n', '\t', ' '], ""))
 				.map_err(|e| format!("z85-encoded failed: {e}"))?
 		} else if let Some(unprefixed) = string.strip_prefix(PLAINTEXT_NEWLINE_PREFIX) {
 			unprefixed.as_bytes().to_owned()
--- a/crates/nixlike/src/lib.rs
+++ b/crates/nixlike/src/lib.rs
@@ -138,7 +138,7 @@
 					}
 				}
 
-				let key = k.into_iter().last().unwrap();
+				let key = k.into_iter().next_back().unwrap();
 				if map.contains_key(&key) {
 					return Err("can't override object");
 				}
--- a/crates/nixlike/src/se_impl.rs
+++ b/crates/nixlike/src/se_impl.rs
@@ -27,9 +27,10 @@
 
 	type Error = Error;
 
-	fn serialize_element<T: ?Sized>(&mut self, value: &T) -> Result<(), Self::Error>
+	fn serialize_element<T>(&mut self, value: &T) -> Result<(), Self::Error>
 	where
 		T: serde::Serialize,
+		T: ?Sized,
 	{
 		self.0.push(value.serialize(MySerialize)?);
 		Ok(())
@@ -44,9 +45,10 @@
 
 	type Error = Error;
 
-	fn serialize_element<T: ?Sized>(&mut self, value: &T) -> Result<(), Self::Error>
+	fn serialize_element<T>(&mut self, value: &T) -> Result<(), Self::Error>
 	where
 		T: serde::Serialize,
+		T: ?Sized,
 	{
 		self.0.push(value.serialize(MySerialize)?);
 		Ok(())
@@ -61,9 +63,10 @@
 
 	type Error = Error;
 
-	fn serialize_field<T: ?Sized>(&mut self, value: &T) -> Result<(), Self::Error>
+	fn serialize_field<T>(&mut self, value: &T) -> Result<(), Self::Error>
 	where
 		T: serde::Serialize,
+		T: ?Sized,
 	{
 		self.0.push(value.serialize(MySerialize)?);
 		Ok(())
@@ -81,9 +84,10 @@
 
 	type Error = Error;
 
-	fn serialize_field<T: ?Sized>(&mut self, value: &T) -> Result<(), Self::Error>
+	fn serialize_field<T>(&mut self, value: &T) -> Result<(), Self::Error>
 	where
 		T: serde::Serialize,
+		T: ?Sized,
 	{
 		self.1.serialize_field(value)
 	}
@@ -102,9 +106,10 @@
 
 	type Error = Error;
 
-	fn serialize_key<T: ?Sized>(&mut self, key: &T) -> Result<(), Self::Error>
+	fn serialize_key<T>(&mut self, key: &T) -> Result<(), Self::Error>
 	where
 		T: serde::Serialize,
+		T: ?Sized,
 	{
 		let _ = self
 			.1
@@ -112,9 +117,10 @@
 		Ok(())
 	}
 
-	fn serialize_value<T: ?Sized>(&mut self, value: &T) -> Result<(), Self::Error>
+	fn serialize_value<T>(&mut self, value: &T) -> Result<(), Self::Error>
 	where
 		T: serde::Serialize,
+		T: ?Sized,
 	{
 		self.0
 			.insert(self.1.take().unwrap(), value.serialize(MySerialize)?);
@@ -133,9 +139,10 @@
 
 	type Error = Error;
 
-	fn serialize_field<T: ?Sized>(&mut self, key: &str, value: &T) -> Result<(), Self::Error>
+	fn serialize_field<T>(&mut self, key: &str, value: &T) -> Result<(), Self::Error>
 	where
 		T: serde::Serialize,
+		T: ?Sized,
 	{
 		self.0.insert(key.to_owned(), value.serialize(MySerialize)?);
 		Ok(())
@@ -153,13 +160,10 @@
 
 	type Error = Error;
 
-	fn serialize_field<T: ?Sized>(
-		&mut self,
-		key: &'static str,
-		value: &T,
-	) -> Result<(), Self::Error>
+	fn serialize_field<T>(&mut self, key: &'static str, value: &T) -> Result<(), Self::Error>
 	where
 		T: serde::Serialize,
+		T: ?Sized,
 	{
 		self.1.insert(key.to_owned(), value.serialize(MySerialize)?);
 		Ok(())
@@ -253,9 +257,10 @@
 		Ok(Value::Null)
 	}
 
-	fn serialize_some<T: ?Sized>(self, value: &T) -> Result<Self::Ok, Self::Error>
+	fn serialize_some<T>(self, value: &T) -> Result<Self::Ok, Self::Error>
 	where
 		T: serde::Serialize,
+		T: ?Sized,
 	{
 		value.serialize(self)
 	}
@@ -277,18 +282,19 @@
 		Ok(Value::String(variant.to_string()))
 	}
 
-	fn serialize_newtype_struct<T: ?Sized>(
+	fn serialize_newtype_struct<T>(
 		self,
 		_name: &'static str,
 		value: &T,
 	) -> Result<Self::Ok, Self::Error>
 	where
 		T: serde::Serialize,
+		T: ?Sized,
 	{
 		value.serialize(self)
 	}
 
-	fn serialize_newtype_variant<T: ?Sized>(
+	fn serialize_newtype_variant<T>(
 		self,
 		_name: &'static str,
 		_variant_index: u32,
@@ -297,6 +303,7 @@
 	) -> Result<Self::Ok, Self::Error>
 	where
 		T: serde::Serialize,
+		T: ?Sized,
 	{
 		Ok(Value::Object(
 			vec![(variant.to_string(), value.serialize(self)?)]