diff --git a/src/Models/Cart.php b/src/Models/Cart.php
index 94b9714..b2626b8 100644
--- a/src/Models/Cart.php
+++ b/src/Models/Cart.php
@@ -243,7 +243,9 @@ class Cart extends Model
 
     public function getTotal(): float
     {
-        return $this->items()->sum('subtotal');
+        // SQL SUM of an integer column comes back as a numeric string under
+        // mysql's PDO driver — cast to honor the declared float return type.
+        return (float) $this->items()->sum('subtotal');
     }
 
     public function getTotalItems(): int
diff --git a/src/Models/ProductCategory.php b/src/Models/ProductCategory.php
index 7aff318..fcfbda2 100644
--- a/src/Models/ProductCategory.php
+++ b/src/Models/ProductCategory.php
@@ -107,7 +107,9 @@ class ProductCategory extends Model
     // Backward compatibility accessor
     public function getIsVisibleAttribute(): bool
     {
-        return $this->attributes['is_visible'] ?? true;
+        // Raw `$attributes['is_visible']` is a tinyint string under PDO mysql.
+        // Cast to bool to honor the declared return type (strict types).
+        return (bool) ($this->attributes['is_visible'] ?? true);
     }
 
     public function getProductCountAttribute(): int