diff --git a/src/Preprocessor.php b/src/Preprocessor.php
index 0273d2cd..6cdd3707 100644
--- a/src/Preprocessor.php
+++ b/src/Preprocessor.php
@@ -801,9 +801,16 @@ class Preprocessor extends CompilerBase
         $arrayInitPlan = null;
         if ($defaultNode !== null) {
             if ($defaultNode instanceof Node\Expr\Array_) {
-                $type = Type::ARRAY;
                 $arrayInitPlan = $this->buildLiteralArrayInitPlan($defaultNode);
                 $default = $arrayInitPlan->expr;
+                // Only narrow the property type to `array` when the declared type
+                // cannot already hold an array. `mixed`/`iterable`/union/nullable
+                // types are represented as php::Var and can legally store an array,
+                // so forcing `array` here would wrongly reject non-array assignments
+                // (e.g. `mixed $value = []` followed by `$this->value = 123`).
+                if ($type !== Type::VAR) {
+                    $type = Type::ARRAY;
+                }
             } else {
                 $default = $this->parseIdentifier($defaultNode);
             }
diff --git a/src/Translator.php b/src/Translator.php
index 676618a3..75da8a1d 100644
--- a/src/Translator.php
+++ b/src/Translator.php
@@ -867,14 +867,22 @@ CODE;
         $code .= '// static property ' . PHP_EOL;
         foreach ($this->symbols->classes() as $classDef) {
             foreach ($classDef->properties as $property) {
-                if (!$property->isStatic() || !$property->arrayInitPlan || !$property->default) {
+                if (!$property->isStatic() || $property->default === null) {
                     continue;
                 }
-                $statement = 'php::setStaticProperty('
-                    . $this->genCharPtr($classDef->getNamespacedName(false), true) . ', '
-                    . $this->genCharPtr($property->name) . ', '
-                    . $property->arrayInitPlan->expr . ');' . PHP_EOL;
-                $code .= $this->wrapArrayInitPlan($property->arrayInitPlan, $statement);
+                if ($property->arrayInitPlan) {
+                    $statement = 'php::setStaticProperty('
+                        . $this->genCharPtr($classDef->getNamespacedName(false), true) . ', '
+                        . $this->genCharPtr($property->name) . ', '
+                        . $property->arrayInitPlan->expr . ');' . PHP_EOL;
+                    $code .= $this->wrapArrayInitPlan($property->arrayInitPlan, $statement);
+                } else {
+                    $statement = 'php::setStaticProperty('
+                        . $this->genCharPtr($classDef->getNamespacedName(false), true) . ', '
+                        . $this->genCharPtr($property->name) . ', '
+                        . 'php::Var(' . $property->default . '));' . PHP_EOL;
+                    $code .= $statement;
+                }
             }
         }
 
@@ -1616,11 +1624,26 @@ CODE;
                         $body .= "typephp_attach_property_handlers(obj, &{$handlers});\n";
                     }
                     foreach ($classDef->properties as $property) {
-                        if (!$property->isStatic() && $property->arrayInitPlan && $property->default) {
+                        if ($property->isStatic() || $property->default === null) {
+                            continue;
+                        }
+                        if ($property->arrayInitPlan) {
                             $init = "auto value = {$property->arrayInitPlan->expr};\n";
                             $init .= 'zend_update_property(obj->ce, obj, ' . $this->genZendStrl($property->name) . ", value.ptr());\n";
                             $init .= "php::throwErrorIfOccurred();\n";
                             $body .= $this->wrapArrayInitPlan($property->arrayInitPlan, $init);
+                        } else {
+                            // Scalar / constant / null default value. Wrap it in a
+                            // php::Var so it can be stored as a zval in the object's
+                            // property table via zend_update_property. Each property is
+                            // wrapped in its own block so the local `value` does not
+                            // clash with siblings declared in the same create_object body.
+                            $init = "do {\n";
+                            $init .= "auto value = php::Var({$property->default});\n";
+                            $init .= 'zend_update_property(obj->ce, obj, ' . $this->genZendStrl($property->name) . ", value.ptr());\n";
+                            $init .= "php::throwErrorIfOccurred();\n";
+                            $init .= "} while (0);\n";
+                            $body .= $init;
                         }
                     }
                     $body .= $classDef->ctorClean;
@@ -2805,13 +2828,13 @@ CODE;
 
         // 接口没有方法实体
         if ($classDef instanceof ClassDef) {
-            $arrayPropCount = 0;
+            $defaultPropCount = 0;
             foreach ($classDef->properties as $property) {
-                if ($property->type === Type::ARRAY && $property->arrayInitPlan && $property->default && !$property->isStatic()) {
-                    $arrayPropCount++;
+                if (!$property->isStatic() && $property->default !== null) {
+                    $defaultPropCount++;
                 }
             }
-            if ($arrayPropCount > 0) {
+            if ($defaultPropCount > 0) {
                 $classDef->requireCtor = true;
             }
             $methods = $classDef->methods;
diff --git a/tests/compiler/object_property/default-mixed-array.phpt b/tests/compiler/object_property/default-mixed-array.phpt
new file mode 100644
index 00000000..dbb4e883
--- /dev/null
+++ b/tests/compiler/object_property/default-mixed-array.phpt
@@ -0,0 +1,52 @@
+--TEST--
+property default value is array with mixed declared type
+--FILE--
+<?php
+
+declare(strict_types=1);
+
+class Test
+{
+    private mixed $value = [];
+
+    public function __construct(mixed $value)
+    {
+        $this->value = $value;
+    }
+
+    public function getValue(): mixed
+    {
+        return $this->value;
+    }
+}
+
+function main()
+{
+    $test = new Test(123);
+    var_dump($test->getValue());
+
+    $test = new Test('test');
+    var_dump($test->getValue());
+
+    $test = new Test([1, 2, 3]);
+    var_dump($test->getValue());
+
+    $test = new Test(new stdClass);
+    $v = $test->getValue();
+    var_dump($v instanceof stdClass);
+    var_dump(get_class($v));
+}
+?>
+--EXPECT--
+int(123)
+string(4) "test"
+array(3) {
+  [0]=>
+  int(1)
+  [1]=>
+  int(2)
+  [2]=>
+  int(3)
+}
+bool(true)
+string(8) "stdClass"
diff --git a/tests/compiler/object_property/default-values.phpt b/tests/compiler/object_property/default-values.phpt
new file mode 100644
index 00000000..a5adcb99
--- /dev/null
+++ b/tests/compiler/object_property/default-values.phpt
@@ -0,0 +1,55 @@
+--TEST--
+various property default values (array, int, float, string, bool, null, const)
+--FILE--
+<?php
+
+class Test
+{
+    public $untypedArray = [];
+    public mixed $mixedArray = [];
+    public array $typedArray = [];
+    public $untypedInt = 123;
+    public int $typedInt = 123;
+    public float $typedFloat = 1.5;
+    public string $typedString = 'hello';
+    public bool $typedBool = true;
+    public $untypedNull = null;
+    public $untypedConst = PHP_INT_MAX;
+
+    public function show(): void
+    {
+        var_dump(
+            $this->untypedArray,
+            $this->mixedArray,
+            $this->typedArray,
+            $this->untypedInt,
+            $this->typedInt,
+            $this->typedFloat,
+            $this->typedString,
+            $this->typedBool,
+            $this->untypedNull,
+            $this->untypedConst
+        );
+    }
+}
+
+function main()
+{
+    $t = new Test();
+    $t->show();
+}
+?>
+--EXPECT--
+array(0) {
+}
+array(0) {
+}
+array(0) {
+}
+int(123)
+int(123)
+float(1.5)
+string(5) "hello"
+bool(true)
+NULL
+int(9223372036854775807)