diff --git a/src/Php/Generator/Utils.php b/src/Php/Generator/Utils.php
index 4d2752ee..6aa19d8d 100644
--- a/src/Php/Generator/Utils.php
+++ b/src/Php/Generator/Utils.php
@@ -18,6 +18,9 @@ trait Utils
         if (is_int($value) or is_float($value)) {
             return $value;
         }
+        if (is_bool($value)) {
+            return $value ? 1 : 0;
+        }
         if (is_string($value)) {
             return $this->genCharPtr($value);
         } else {
diff --git a/src/Php/Preprocessor.php b/src/Php/Preprocessor.php
index bfd2911b..6f2e3c4d 100644
--- a/src/Php/Preprocessor.php
+++ b/src/Php/Preprocessor.php
@@ -251,6 +251,9 @@ class Preprocessor extends CompilerBase
                     $nullable = false;
                 }
                 $default = $this->parseParamDefaultValue($param->default);
+                if ($this->classDef->hasProperty($name)) {
+                    $this->fatalError($param, "Duplicate property `{$name}`");
+                }
                 $propertyDef = new PropertyDef($name, $param->flags, $type, $default, $nullable);
                 $this->classDef->properties[$name] = $propertyDef;
             }
@@ -542,7 +545,11 @@ class Preprocessor extends CompilerBase
         $type = $this->parseTypeDecl($v->type, self::DECL_TYPE_OF_PROPERTY, $class);
 
         foreach ($v->props as $prop) {
-            $propDef = new PropertyDef($this->parseIdentifier($prop->name), $flags, $type);
+            $propName = $this->parseIdentifier($prop->name);
+            if ($this->classDef->hasProperty($propName)) {
+                $this->fatalError($v, "Duplicate property `{$propName}`");
+            }
+            $propDef = new PropertyDef($propName, $flags, $type);
             if ($prop->default) {
                 $propDef->default = $this->parseIdentifier($prop->default);
                 if ($prop->default->getType() == 'Expr_Array') {
diff --git a/src/Php/Translator.php b/src/Php/Translator.php
index fbd1a73d..4c9e2a50 100644
--- a/src/Php/Translator.php
+++ b/src/Php/Translator.php
@@ -591,6 +591,8 @@ class Translator extends Preprocessor
                 }
             } elseif (is_float($value)) {
                 return $value;
+            } else if (is_bool($value)) {
+                return $value ? 1 : 0;
             } elseif (is_string($value)) {
                 return $this->genCharPtr($value);
             } else {
diff --git a/src/gen_stub.php b/src/gen_stub.php
index a9239092..9527117c 100755
--- a/src/gen_stub.php
+++ b/src/gen_stub.php
@@ -2437,6 +2437,7 @@ class EvaluatedValue
         // $this->expr has all its PHP constants replaced by C constants
         $prettyPrinter = new Standard;
         $expr = $prettyPrinter->prettyPrintExpr($this->expr);
+
         // PHP single-quote to C double-quote string
         if ($this->type->isString()) {
             if (
@@ -2449,15 +2450,16 @@ class EvaluatedValue
                 } else {
                     return $this->value;
                 }
+            } elseif ($this->expr instanceof Expr\ConstFetch) {
+                return getTranslator()->getConstValue($this->expr->name->toString());
             } elseif (!($this->expr instanceof String_)) {
-                if ($this->expr instanceof Expr\ConstFetch) {
-                    return getTranslator()->getConstValue($this->expr->name->toString());
-                }
                 throw new Exception("Expression at line " . $this->expr->getStartLine() . " must be a scalar string");
             }
             $expr = preg_replace("/(^'|'$)/", '"', $expr);
-        } elseif ($this->type->isInt() or $this->type->isFloat() or $this->expr instanceof Expr\ConstFetch) {
+        } elseif ($this->type->isInt() or $this->type->isFloat()) {
             return strval($this->value);
+        } elseif ($this->type->isBool()) {
+            return $this->value ? 'true' : 'false';
         }
         return $expr[0] == '"' ? $expr : preg_replace('(\bnull\b)', 'NULL', str_replace('\\', '', $expr));
     }
diff --git a/tests/aot/object_property/002.phpt b/tests/aot/object_property/002.phpt
new file mode 100644
index 00000000..94614e3b
--- /dev/null
+++ b/tests/aot/object_property/002.phpt
@@ -0,0 +1,26 @@
+--TEST--
+default array property
+--FILE--
+<?php
+
+class Test {
+    protected bool|int $attr1 = false;
+    protected string $attr2 = 'hello';
+    protected int $attr3 = 1232;
+    protected float $attr4 = 3.1415;
+
+    function bar() {
+        var_dump($this->attr1, $this->attr2, $this->attr3, $this->attr4);
+    }
+}
+
+function main() {
+    $obj = new Test;
+    $obj->bar();
+}
+?>
+--EXPECT--
+bool(false)
+string(5) "hello"
+int(1232)
+float(3.1415)
\ No newline at end of file