Make RouteMode enum backed (#1362)

.php-cs-fixer.php

@@ -132,6 +132,7 @@ $finder = Finder::create()
     ->in([
         $project_path . '/src',
     ])
+    ->exclude('Enums')
     ->name('*.php')
     ->notName('*.blade.php')
     ->ignoreDotFiles(true)

src/Enums/RouteMode.php

@@ -4,9 +4,12 @@ declare(strict_types=1);
 
 namespace Stancl\Tenancy\Enums;
 
-enum RouteMode
+/**
+ * Note: The backing values are not part of the public API and are subject to change.
+ */
+enum RouteMode: int
 {
-    case TENANT;
-    case CENTRAL;
-    case UNIVERSAL;
+    case CENTRAL   = 0b01;
+    case TENANT    = 0b10;
+    case UNIVERSAL = 0b11;
 }