Meilisearch: support filtering with backed enums (#759)

* Meilisearch: support filtering with backed enums

* Update composer.json

---------

Co-authored-by: Taylor Otwell <taylor@laravel.com>

Author: Carlwirkus

src/Engines/MeilisearchEngine.php

@@ -2,6 +2,7 @@
 
 namespace Laravel\Scout\Engines;
 
+use BackedEnum;
 use Illuminate\Support\LazyCollection;
 use Laravel\Scout\Builder;
 use Laravel\Scout\Jobs\RemoveableScoutCollection;
@@ -172,6 +173,10 @@ protected function filters(Builder $builder)
                 return sprintf('%s=%s', $key, $value ? 'true' : 'false');
             }
 
+            if ($value instanceof BackedEnum) {
+                return sprintf('%s=%s', $key, $value->value);
+            }
+
             return is_numeric($value)
                             ? sprintf('%s=%s', $key, $value)
                             : sprintf('%s="%s"', $key, $value);