Make implicit binding more generic.

Allow any object implementing UrlRoutable to be implicitly resolved.

src/Illuminate/Broadcasting/Broadcasters/Broadcaster.php

@@ -6,6 +6,7 @@
 use Illuminate\Support\Str;
 use Illuminate\Container\Container;
 use Illuminate\Database\Eloquent\Model;
+use Illuminate\Contracts\Routing\UrlRoutable;
 use Illuminate\Contracts\Routing\BindingRegistrar;
 use Symfony\Component\HttpKernel\Exception\AccessDeniedHttpException;
 use Illuminate\Contracts\Broadcasting\Broadcaster as BroadcasterContract;
@@ -171,7 +172,7 @@ protected function resolveImplicitBindingIfPossible($key, $value, $callbackParam
     protected function isImplicitlyBindable($key, $parameter)
     {
         return $parameter->name === $key && $parameter->getClass() &&
-                $parameter->getClass()->isSubclassOf(Model::class);
+                        $parameter->getClass()->isSubclassOf(UrlRoutable::class);
     }
 
     /**

src/Illuminate/Routing/ImplicitRouteBinding.php

@@ -4,6 +4,7 @@
 
 use Illuminate\Support\Str;
 use Illuminate\Database\Eloquent\Model;
+use Illuminate\Contracts\Routing\UrlRoutable;
 use Illuminate\Database\Eloquent\ModelNotFoundException;
 
 class ImplicitRouteBinding
@@ -19,14 +20,14 @@ public static function resolveForRoute($container, $route)
     {
         $parameters = $route->parameters();
 
-        foreach ($route->signatureParameters(Model::class) as $parameter) {
+        foreach ($route->signatureParameters(UrlRoutable::class) as $parameter) {
             if (! $parameterName = static::getParameterName($parameter->name, $parameters)) {
                 continue;
             }
 
             $parameterValue = $parameters[$parameterName];
 
-            if ($parameterValue instanceof Model) {
+            if ($parameterValue instanceof UrlRoutable) {
                 continue;
             }