Added ImmutableTimezonedDatetime cast detection

README.md

@@ -149,7 +149,7 @@ $model->published_at = Timezone::date($request->published_at);
 
 ### Edge cases
 
-If you need to use the `TimezonedDatetime` cast on the timestamp columns (`created_at` and/or `updated_at`) AND you're expecting to handle dates with timezones other than UTC or the one you've defined with `Timezone::set()`, you will need to apply the `Whitecube\LaravelTimezones\Concerns\HasTimezonedTimestamps` trait on your model.
+If you need to use the `TimezonedDatetime` or `ImmutableTimezonedDatetime` casts on the default timestamp columns (`created_at` and/or `updated_at`) AND you're expecting to handle dates with timezones other than UTC or the one you've defined with `Timezone::set()`, you will need to apply the `Whitecube\LaravelTimezones\Concerns\HasTimezonedTimestamps` trait on your model.
 
 This is necessary to prevent Laravel's casting of those attributes to occur, which would transform the value in a way where the timezone information is lost, preventing our cast from working properly.
 

src/Concerns/HasTimezonedTimestamps.php

@@ -28,8 +28,17 @@ protected function isDateAttribute($key)
      */
     protected function hasTimezonedDatetimeCast(string $key): bool
     {
-        $casts = $this->getCasts();
+        $cast = $this->getCasts()[$key] ?? null;
 
-        return array_key_exists($key, $casts) && $casts[$key] === TimezonedDatetime::class;
+        if (! $cast) {
+            return false;
+        }
+
+        $castClassName = explode(':', $cast)[0];
+
+        return in_array(
+            $castClassName, 
+            [TimezonedDatetime::class, ImmutableTimezonedDatetime::class]
+        );
     }
 }