优化getChangedData判断

修复多态关联无法保存的问题

library/think/Model.php

@@ -1267,10 +1267,18 @@ abstract class Model implements \JsonSerializable, \ArrayAccess
             $data = $this->data;
         } else {
             $data = array_udiff_assoc($this->data, $this->origin, function ($a, $b) {
+                if (is_numeric($a) && is_numeric($b)) {
+                    if (strcmp($a, $b) !== 0) {
+                        return 1;
+                    }
+                    if ($a == $b) {
+                        return 0;
+                    }
+                }
                 if ((empty($a) || empty($b)) && $a !== $b) {
                     return 1;
                 }
-                return is_object($a) || $a != $b ? 1 : 0;
+                return is_object($a) || $a !== $b ? 1 : 0;
             });
         }
 

library/think/model/relation/MorphOne.php

@@ -211,7 +211,7 @@ class MorphOne extends Relation
 
         $model = new $this->model();
 
-        return $model->save() ? $model : false;
+        return $model->save($data) ? $model : false;
     }
 
     /**