Patch side effect functions

src/Methods/ArraysMethods.php

@@ -505,19 +505,15 @@ public static function reject($array, Closure $closure)
      */
     public static function removeFirst($array)
     {
-        array_shift($array);
-
-        return $array;
+        return array_slice($array, 1);
     }
 
     /**
      * Remove the last value from an array.
      */
     public static function removeLast($array)
     {
-        array_pop($array);
-
-        return $array;
+        return array_slice($array, 0, -1);
     }
 
     /**
@@ -551,19 +547,15 @@ public static function removeValue($array, $value)
      */
     public static function prepend($array, $value)
     {
-        array_unshift($array, $value);
-
-        return $array;
+        return array_merge([$value], $array);
     }
 
     /**
      * Append a value to an array.
      */
     public static function append($array, $value)
     {
-        array_push($array, $value);
-
-        return $array;
+        return  array_merge($array, [$value]);
     }
 
     /*