Version 5.0.0 beta 2

system/Db/Select.php

@@ -269,7 +269,7 @@ class Select implements Iterator, Countable
 	/**
 	 * @brief	Key Field
 	 */
-	protected ?string $keyField = NULL;
+	protected mixed $keyField = NULL;
 
 	/**
 	 * @brief	Key Table
@@ -279,7 +279,7 @@ class Select implements Iterator, Countable
 	/**
 	 * @brief	Value Field
 	 */
-	protected ?string $valueField = NULL;
+	protected mixed $valueField = NULL;
 
 	/**
 	 * @brief	Value Table