Route map/get/post... return self and not mixed

src/Route.php

@@ -397,7 +397,7 @@ class Route
       *       });
       * @param string $route Route to check with the URL
       * @param callable $function Function to be executed if the route match
-      * @return mixed Exit of the PHP after displaying the page if match, or return the
+      * @return self Exit of the PHP after displaying the page if match, or return the
       * route object to chain it whith the next test
       */
     public function get($route, $function)
@@ -423,7 +423,7 @@ class Route
       *       });
       * @param string $route Route to check with the URL
       * @param callable $function Function to be executed if the route match
-      * @return mixed Exit of the PHP after displaying the page if match, or return the
+      * @return self Exit of the PHP after displaying the page if match, or return the
       * route object to chain it whith the next test
       */
     public function post($route, $function)
@@ -449,7 +449,7 @@ class Route
       *       });
       * @param string $route Route to check with the URL
       * @param callable $function Function to be executed if the route match
-      * @return mixed Exit of the PHP after displaying the page if match, or return the
+      * @return self Exit of the PHP after displaying the page if match, or return the
       * route object to chain it whith the next test
       */
     public function put($route, $function)
@@ -475,7 +475,7 @@ class Route
       *       });
       * @param string $route Route to check with the URL
       * @param callable $function Function to be executed if the route match
-      * @return mixed Exit of the PHP after displaying the page if match, or return the
+      * @return self Exit of the PHP after displaying the page if match, or return the
       * route object to chain it whith the next test
       */
     public function delete($route, $function)
@@ -501,7 +501,7 @@ class Route
       *       });
       * @param string $route Route to check with the URL
       * @param callable $function Function to be executed if the route match
-      * @return mixed Exit of the PHP after displaying the page if match, or return the
+      * @return self Exit of the PHP after displaying the page if match, or return the
       * route object to chain it whith the next test
       */
     public function options($route, $function)
@@ -529,7 +529,7 @@ class Route
       * @param string $methods The allowed methods, separated by commas (,)
       * @param string $route Route to check with the URL
       * @param callable $function Function to be executed if the route match
-      * @return mixed Exit of the PHP after displaying the page if match, or return the
+      * @return self Exit of the PHP after displaying the page if match, or return the
       * route object to chain it whith the next test
       */
     public function multi($methods, $route, $function)
@@ -544,7 +544,7 @@ class Route
       * thereis a match
       * @param string $route Route to check with the URL
       * @param callable $function Function to be executed if the route match
-      * @return mixed Exit of the PHP after displaying the page if match, or return the
+      * @return self Exit of the PHP after displaying the page if match, or return the
       * route object to chain it whith the next test
       */
     public function map($route, $function)