feat: Ensure tail must have array values to work with

src/Traits/ArrayPrefix.php

@@ -97,7 +97,8 @@ public function head(bool $preserveKeys = false)
 
     public function tail(): ArrayedInterface
     {
-        return $this->slice(1);
+        return $this->when($this->getWorkableItem())
+            ->slice(1);
     }
 
     private function when($truthyValue, $default = Undefined::class)

tests/ArrayPrefixTraitTest.php

@@ -214,5 +214,10 @@ public function testTail(): void
             ['c' => 'd'],
             arrayed($data)->tail()->result(),
         );
+
+        // Test empty.
+        $this->expectException(\InvalidArgumentException::class);
+
+        arrayed([])->tail();
     }
 }