Fix scalar split and zero-average behavior

packages/scalars/src/ArrayObject.php

@@ -318,13 +318,13 @@ public function sum(): float|int
      */
     public function avg(): float|int|null
     {
-        $sum = $this->sum();
+        $count = $this->count();
 
-        if ($sum === 0 || $sum === 0.0) {
+        if ($count === 0) {
             return null;
         }
 
-        return $sum / $this->count();
+        return $this->sum() / $count;
     }
 
     /**

packages/scalars/src/StringObject.php

@@ -149,6 +149,10 @@ public static function wrap(mixed $string = '', ?string $encoding = self::ENCODI
      */
     public function __call(string $name, array $args): mixed
     {
+        if ($name === 'split') {
+            return $this->explode(...$args);
+        }
+
         $class = Str::class;
 
         if (is_callable([$class, $name])) {
@@ -158,7 +162,6 @@ public function __call(string $name, array $args): mixed
         $maps = [
             'toUpperCase' => [Utf8String::class, 'strtoupper'],
             'toLowerCase' => [Utf8String::class, 'strtolower'],
-            'split' => [$this, 'explode'],
         ];
 
         if ($maps[$name] ?? null) {

packages/scalars/test/ArrayObjectTest.php

@@ -691,11 +691,18 @@ public function searchWithClosureReturnsFalseWhenNothingMatches(): void
     }
 
     #[Test]
-    public function avgReturnsNullWhenSumIsZero(): void
+    public function avgReturnsNullWhenArrayIsEmpty(): void
     {
         self::assertNull(arr([])->avg());
     }
 
+    #[Test]
+    public function avgReturnsZeroWhenSumIsZero(): void
+    {
+        self::assertSame(0, arr([1, -1])->avg());
+        self::assertSame(0, arr([0, 0])->avg());
+    }
+
     #[Test]
     public function wrapReturnsSameInstanceWhenAlreadyWrapped(): void
     {

packages/scalars/test/StringObjectTest.php

@@ -1,4 +1,4 @@
 <?php
 
 declare(strict_types=1);
 
@@ -525,6 +525,15 @@
         ];
     }
 
+    #[Test]
+    public function splitSplitsStringByDelimiter(): void
+    {
+        self::assertEquals(
+            ['Foo', 'Bar', 'Yoo'],
+            (new StringObject('Foo/Bar/Yoo'))->split('/')->dump()
+        );
+    }
+
     #[Test]
     public function applyReturnsNewInstanceFromCallbackResult()
     {