DEBUG ONLY: Revert "drop FactoryTrait"

This reverts commit a7c8190.

src/DIContainerTrait.php

@@ -119,7 +119,7 @@ public static function checkInstanceOf(object $object)// :static supported by PH
      */
     public static function fromSeed($seed = [])// :static supported by PHP8+
     {// @TODO move code from addTo here
-        return static::addTo(Shared::getFactory(), $seed, [], true);
+        return static::addTo(GlobalInternal::getDefaultFactory(), $seed, [], true);
     }
 
     /**
@@ -131,6 +131,6 @@ public static function fromSeed($seed = [])// :static supported by PHP8+
      */
     public static function fromSeedWithCl($seed = [])// :static supported by PHP8+
     {// @TODO move code from addTo here
-        return static::addToWithCl(Shared::getFactory(), $seed, [], true);
+        return static::addToWithCl(GlobalInternal::getDefaultFactory(), $seed, [], true);
     }
 }

src/FactoryTrait.php

@@ -0,0 +1,31 @@
+<?php
+
+declare(strict_types=1);
+
+namespace atk4\core;
+
+trait FactoryTrait
+{
+    /**
+     * Check this property to see if trait is present in the object.
+     *
+     * @var bool
+     */
+    public $_factoryTrait = true;
+
+    /**
+     * See \atk4\core\Factory::mergeSeeds().
+     */
+    public function mergeSeeds($seed, $seed2, ...$more_seeds)
+    {
+        return GlobalInternal::getDefaultFactory()->mergeSeeds($seed, $seed2, $more_seeds);
+    }
+
+    /**
+     * See \atk4\core\Factory::factory().
+     */
+    public function factory($seed, $defaults = []): object
+    {
+        return GlobalInternal::getDefaultFactory()->factory($seed, $defaults);
+    }
+}

src/GlobalInternal.php

@@ -0,0 +1,28 @@
+<?php
+
+declare(strict_types=1);
+
+namespace atk4\core;
+
+class GlobalInternal
+{
+    /** @var Factory */
+    private static $_defaultFactory;
+
+    private function __construct()
+    {
+        // zeroton
+    }
+
+    /**
+     * @return FactoryTrait
+     */
+    public static function getDefaultFactory()
+    {
+        if (self::$_defaultFactory === null) {
+            self::$_defaultFactory = new Factory();
+        }
+
+        return self::$_defaultFactory;
+    }
+}