diff --git a/lib/Factories/Event_Type.php b/lib/Factories/Event_Type.php
index 014c283..50da9d6 100644
--- a/lib/Factories/Event_Type.php
+++ b/lib/Factories/Event_Type.php
@@ -13,6 +13,7 @@
 use Underpin\Enums\Logger_Item_Events;
 use Underpin\Exceptions\Invalid_Registry_Item;
 use Underpin\Exceptions\Operation_Failed;
+use Underpin\Exceptions\Unknown_Registry_Item;
 use Underpin\Interfaces;
 use Underpin\Interfaces\Can_Convert_To_Array;
 use Underpin\Interfaces\Data_Provider;
@@ -173,11 +174,13 @@ protected function broadcast( Logger_Item_Events $id, ?Data_Provider $provider =
 
 	/**
 	 * @param Logger_Item_Events $key
-	 * @param Observer           $observer
+	 * @param callable           $observer
 	 *
 	 * @return $this
+	 * @throws Operation_Failed
+	 * @throws Unknown_Registry_Item
 	 */
-	public function attach( Logger_Item_Events $key, Observer $observer ): static {
+	public function attach( Logger_Item_Events $key, callable $observer ): static {
 		$this->get_broadcaster()->attach( $key->name, $observer );
 
 		return $this;
diff --git a/lib/Helpers/Array_Helper.php b/lib/Helpers/Array_Helper.php
index e81014b..711c7b1 100644
--- a/lib/Helpers/Array_Helper.php
+++ b/lib/Helpers/Array_Helper.php
@@ -15,7 +15,14 @@ class Array_Helper {
 
 	use With_Closure_Converter;
 
-	public static function process( $subject ): Array_Processor {
+	/**
+	 * Process this array
+	 *
+	 * @param mixed $subject
+	 *
+	 * @return Array_Processor
+	 */
+	public static function process( mixed $subject ): Array_Processor {
 		return new Array_Processor( self::wrap( $subject ) );
 	}
 
@@ -312,7 +319,7 @@ public static function reverse( array $subject, bool $preserve_keys = true ): ar
 	 *
 	 * @return mixed The value
 	 */
-	public static function pluck( array $item, string $key, mixed $default = null ): mixed {
+	public static function pluck( mixed $item, string $key, mixed $default = null ): mixed {
 		$array = self::wrap( $item );
 
 		if ( isset( $array[ $key ] ) ) {
@@ -396,7 +403,7 @@ public static function is_associative( array $items ): bool {
 	 *
 	 * @return void
 	 */
-	public static function prepend( array &$array, mixed ...$items ): void {
+	public static function prepend( mixed &$array, mixed ...$items ): void {
 		$array = self::wrap( $array );
 		array_unshift( $array, ...$items );
 	}
@@ -409,7 +416,7 @@ public static function prepend( array &$array, mixed ...$items ): void {
 	 *
 	 * @return void
 	 */
-	public static function append( array &$array, mixed ...$items ): void {
+	public static function append( mixed &$array, mixed ...$items ): void {
 		$array = self::wrap( $array );
 		foreach ( $items as $item ) {
 			$array[] = $item;
diff --git a/lib/Registries/Logger.php b/lib/Registries/Logger.php
index f155440..4a6ef94 100644
--- a/lib/Registries/Logger.php
+++ b/lib/Registries/Logger.php
@@ -7,21 +7,16 @@
 use Underpin\Abstracts\Registries\Object_Registry;
 use Underpin\Enums\Logger_Events;
 use Underpin\Exceptions\Instance_Not_Ready;
-use Underpin\Exceptions\Invalid_Callback;
 use Underpin\Exceptions\Invalid_Registry_Item;
 use Underpin\Exceptions\Operation_Failed;
 use Underpin\Exceptions\Unknown_Registry_Item;
 use Underpin\Factories\Data_Providers\Int_Provider;
 use Underpin\Factories\Event_Type;
 use Underpin\Factories\Log_Item;
-use Underpin\Helpers\Array_Helper;
-use Underpin\Helpers\Processors\Array_Processor;
 use Underpin\Interfaces as Interfaces;
 use Underpin\Interfaces\Data_Provider;
-use Underpin\Interfaces\Observer;
 use Underpin\Interfaces\Singleton;
 use Underpin\Traits\With_Broadcaster;
-use UnitEnum;
 
 
 /**