diff --git a/Core/Session.php b/Core/Session.php
index b2f569295..3089f85e5 100644
--- a/Core/Session.php
+++ b/Core/Session.php
@@ -58,7 +58,10 @@ final function offsetUnset($k) {$this->_st->offsetUnset($this->k($k));}
 	 * 2021-10-26
 	 * @used-by s()
 	 */
-	private function __construct() {$this->_st = df_o($this->c());}
+	private function __construct() {
+		$this->_prefix = df_class_flc($this);
+		$this->_st = df_o($this->c());
+	}
 
 	/**
 	 * 2021-10-26
@@ -69,7 +72,15 @@ private function __construct() {$this->_st = df_o($this->c());}
 	 * @param string $k [optional]
 	 * @return string
 	 */
-	private function k($k) {return "df_$k";}
+	private function k($k) {return "{$this->_prefix}_$k";}
+
+	/**
+	 * 2021-10-27
+	 * @used-by __construct()
+	 * @used-by k()
+	 * @var string
+	 */
+	private $_prefix;
 
 	/**
 	 * 2021-10-26
diff --git a/Core/lib/reflection/main.php b/Core/lib/reflection/main.php
index 84720dc06..1d9687d14 100644
--- a/Core/lib/reflection/main.php
+++ b/Core/lib/reflection/main.php
@@ -65,12 +65,22 @@ function df_class_exists($c) {$c = df_ctr($c); return @class_exists($c);}
  * 2016-01-01
  * 2016-10-20
  * Making $c optional leads to the error «get_class() called without object from outside a class»: https://3v4l.org/k6Hd5
+ * @used-by df_class_flc()
  * @used-by df_class_my()
  * @param string|object $c
  * @return string
  */
 function df_class_f($c) {return df_first(df_explode_class($c));}
 
+/**
+ * 2021-10-27
+ * @see df_class_llc()
+ * @used-by \Df\Core\Session::__construct()
+ * @param string|object $c
+ * @return string
+ */
+function df_class_flc($c) {return strtolower(df_class_f($c));}
+
 /**
  * 2017-01-10
  * @uses df_cts() отсекает окончание «\Interceptor»: без этого функция работала бы не так, как мы хотим
diff --git a/composer.json b/composer.json
index 1c8c7a1f9..b75e81516 100644
--- a/composer.json
+++ b/composer.json
@@ -1,6 +1,6 @@
 {
 	"name": "mage2pro/core"
-	,"version": "7.8.6"
+	,"version": "7.8.7"
 	,"description": "Mage2.PRO core package."
 	,"type": "magento2-module"
 	,"homepage": "https://mage2.pro"