👔 up: move some text class to extlib package

Author: inhere

src/Ext/TextScanner.php

@@ -16,11 +16,13 @@
 trait SingletonPoolTrait
 {
     /**
-     * @var array
+     * @var array<string, object>
      */
     private static array $singletons = [];
 
     /**
+     * Get singleton instance of the class.
+     *
      * @param string $class
      *
      * @return mixed

src/Obj/Traits/SingletonPoolTrait.php

@@ -13,14 +13,25 @@
 
 /**
  * Trait SingletonTrait
- *
  */
 trait SingletonTrait
 {
     /**
-     * @return mixed
+     * Alias of instance.
+     *
+     * @return static
+     */
+    public static function new(): static
+    {
+        return Obj::singleton(static::class);
+    }
+
+    /**
+     * Get singleton instance of the class.
+     *
+     * @return static
      */
-    public static function new(): mixed
+    public static function instance(): static
     {
         return Obj::singleton(static::class);
     }