Fix JSON serialization

Author: jessarcher

composer.json

@@ -24,7 +24,8 @@
     "require": {
         "php": "^7.4",
         "illuminate/contracts": "^8.0",
-        "spatie/data-transfer-object": "^2.5.0"
+        "spatie/data-transfer-object": "^2.5.0",
+        "thecodingmachine/safe": "^1.3"
     },
     "require-dev": {
         "orchestra/testbench": "^6.0",

src/Casts/DataTransferObject.php

@@ -26,7 +26,7 @@ public function get($model, $key, $value, $attributes)
             return;
         }
 
-        return new $this->class(json_decode($value, true));
+        return $this->class::fromJson($value);
     }
 
     /**
@@ -46,6 +46,6 @@ public function set($model, $key, $value, $attributes)
             throw new InvalidArgumentException("Value must be of type [$this->class], array, or null");
         }
 
-        return json_encode($value->toArray());
+        return $value->toJson();
     }
 }