diff --git a/src/main/php/lang/reflection/Modifiers.class.php b/src/main/php/lang/reflection/Modifiers.class.php
index 05c60e9..faea9dc 100755
--- a/src/main/php/lang/reflection/Modifiers.class.php
+++ b/src/main/php/lang/reflection/Modifiers.class.php
@@ -1,6 +1,6 @@
 <?php namespace lang\reflection;
 
-use lang\Value;
+use lang\{Value, IllegalArgumentException};
 
 /**
  * Type and member modifiers
@@ -8,24 +8,30 @@
  * @test lang.reflection.unittest.ModifiersTest
  */
 class Modifiers implements Value {
-  const IS_STATIC    = MODIFIER_STATIC;
-  const IS_ABSTRACT  = MODIFIER_ABSTRACT;
-  const IS_FINAL     = MODIFIER_FINAL;
-  const IS_PUBLIC    = MODIFIER_PUBLIC;
-  const IS_PROTECTED = MODIFIER_PROTECTED;
-  const IS_PRIVATE   = MODIFIER_PRIVATE;
-  const IS_READONLY  = 0x0080; // XP 10.13: MODIFIER_READONLY
-  const IS_NATIVE    = 0xF000;
+  const IS_STATIC        = MODIFIER_STATIC;
+  const IS_ABSTRACT      = MODIFIER_ABSTRACT;
+  const IS_FINAL         = MODIFIER_FINAL;
+  const IS_PUBLIC        = MODIFIER_PUBLIC;
+  const IS_PROTECTED     = MODIFIER_PROTECTED;
+  const IS_PRIVATE       = MODIFIER_PRIVATE;
+  const IS_READONLY      = MODIFIER_READONLY;
+  const IS_PRIVATE_SET   = 0x0400;
+  const IS_PROTECTED_SET = 0x0800;
+  const IS_PUBLIC_SET    = 0x1000;
+  const IS_NATIVE        = 0x10000;
 
   private static $names= [
-    'public'    => self::IS_PUBLIC,
-    'protected' => self::IS_PROTECTED,
-    'private'   => self::IS_PRIVATE,
-    'static'    => self::IS_STATIC,
-    'final'     => self::IS_FINAL,
-    'abstract'  => self::IS_ABSTRACT,
-    'native'    => self::IS_NATIVE,
-    'readonly'  => self::IS_READONLY,
+    'public'         => self::IS_PUBLIC,
+    'protected'      => self::IS_PROTECTED,
+    'private'        => self::IS_PRIVATE,
+    'static'         => self::IS_STATIC,
+    'final'          => self::IS_FINAL,
+    'abstract'       => self::IS_ABSTRACT,
+    'native'         => self::IS_NATIVE,
+    'readonly'       => self::IS_READONLY,
+    'private(set)'   => self::IS_PRIVATE_SET,
+    'protected(set)' => self::IS_PROTECTED_SET,
+    'public(set)'    => self::IS_PUBLIC_SET,
   ];
   private $bits;
 
@@ -103,19 +109,55 @@ public function isAbstract() { return 0 !== ($this->bits & self::IS_ABSTRACT); }
   public function isFinal() { return 0 !== ($this->bits & self::IS_FINAL); }
 
   /** @return bool */
-  public function isPublic() { return 0 !== ($this->bits & self::IS_PUBLIC); }
+  public function isNative() { return 0 !== ($this->bits & self::IS_NATIVE); }
 
   /** @return bool */
-  public function isProtected() { return 0 !== ($this->bits & self::IS_PROTECTED); }
+  public function isReadonly() { return 0 !== ($this->bits & self::IS_READONLY); }
 
-  /** @return bool */
-  public function isPrivate() { return 0 !== ($this->bits & self::IS_PRIVATE); }
+  /**
+   * Gets whether these modifiers are public in regard to the specified hook
+   *
+   * @param  ?string $hook
+   * @return bool
+   * @throws lang.IllegalArgumentException
+   */
+  public function isPublic($hook= 'get') {
+    switch ($hook) {
+      case 'get': return 0 !== ($this->bits & self::IS_PUBLIC);
+      case 'set': return 0 !== ($this->bits & self::IS_PUBLIC_SET);
+      default: throw new IllegalArgumentException('Unknown hook '.$hook);
+    }
+  }
 
-  /** @return bool */
-  public function isNative() { return 0 !== ($this->bits & self::IS_NATIVE); }
+  /**
+   * Gets whether these modifiers are protected in regard to the specified hook
+   *
+   * @param  ?string $hook
+   * @return bool
+   * @throws lang.IllegalArgumentException
+   */
+  public function isProtected($hook= 'get') {
+    switch ($hook) {
+      case 'get': return 0 !== ($this->bits & self::IS_PROTECTED);
+      case 'set': return 0 !== ($this->bits & self::IS_PROTECTED_SET);
+      default: throw new IllegalArgumentException('Unknown hook '.$hook);
+    }
+  }
 
-  /** @return bool */
-  public function isReadonly() { return 0 !== ($this->bits & self::IS_READONLY); }
+  /**
+   * Gets whether these modifiers are private in regard to the specified hook
+   *
+   * @param  ?string $hook
+   * @return bool
+   * @throws lang.IllegalArgumentException
+   */
+  public function isPrivate($hook= 'get') {
+    switch ($hook) {
+      case 'get': return 0 !== ($this->bits & self::IS_PRIVATE);
+      case 'set': return 0 !== ($this->bits & self::IS_PRIVATE_SET);
+      default: throw new IllegalArgumentException('Unknown hook '.$hook);
+    }
+  }
 
   /**
    * Compares a given value to this modifiers instance
diff --git a/src/test/php/lang/reflection/unittest/ModifiersTest.class.php b/src/test/php/lang/reflection/unittest/ModifiersTest.class.php
index 7ca9975..5b62355 100755
--- a/src/test/php/lang/reflection/unittest/ModifiersTest.class.php
+++ b/src/test/php/lang/reflection/unittest/ModifiersTest.class.php
@@ -15,6 +15,9 @@ private function cases() {
     yield [Modifiers::IS_PRIVATE, 'private'];
     yield [Modifiers::IS_NATIVE, 'native'];
     yield [Modifiers::IS_READONLY, 'readonly'];
+    yield [Modifiers::IS_PRIVATE_SET, 'private(set)'];
+    yield [Modifiers::IS_PROTECTED_SET, 'protected(set)'];
+    yield [Modifiers::IS_PUBLIC_SET, 'public(set)'];
     yield [Modifiers::IS_FINAL | Modifiers::IS_PUBLIC, 'public final'];
     yield [Modifiers::IS_ABSTRACT | Modifiers::IS_PUBLIC, 'public abstract'];
     yield [Modifiers::IS_ABSTRACT | Modifiers::IS_PROTECTED, 'protected abstract'];
@@ -83,6 +86,36 @@ public function isReadonly($input, $expected) {
     Assert::equals($expected, (new Modifiers($input))->isReadonly());
   }
 
+  #[Test, Values([['public(set)', true], ['public', true]])]
+  public function isPublicGet($input, $expected) {
+    Assert::equals($expected, (new Modifiers($input))->isPublic('get'));
+  }
+
+  #[Test, Values([['protected(set)', false], ['protected', true]])]
+  public function isProtectedGet($input, $expected) {
+    Assert::equals($expected, (new Modifiers($input))->isProtected('get'));
+  }
+
+  #[Test, Values([['private(set)', false], ['private', true]])]
+  public function isPrivateGet($input, $expected) {
+    Assert::equals($expected, (new Modifiers($input))->isPrivate('get'));
+  }
+
+  #[Test, Values([['public(set)', true], ['public', false]])]
+  public function isPublicSet($input, $expected) {
+    Assert::equals($expected, (new Modifiers($input))->isPublic('set'));
+  }
+
+  #[Test, Values([['protected(set)', true], ['protected', false]])]
+  public function isProtectedSet($input, $expected) {
+    Assert::equals($expected, (new Modifiers($input))->isProtected('set'));
+  }
+
+  #[Test, Values([['private(set)', true], ['private', false]])]
+  public function isPrivateSet($input, $expected) {
+    Assert::equals($expected, (new Modifiers($input))->isPrivate('set'));
+  }
+
   #[Test]
   public function public_modifier_default_no_arg() {
     Assert::true((new Modifiers())->isPublic());
diff --git a/src/test/php/lang/reflection/unittest/PropertiesTest.class.php b/src/test/php/lang/reflection/unittest/PropertiesTest.class.php
index 8576b59..1c349fc 100755
--- a/src/test/php/lang/reflection/unittest/PropertiesTest.class.php
+++ b/src/test/php/lang/reflection/unittest/PropertiesTest.class.php
@@ -227,4 +227,13 @@ public function set_accessing_failed_exceptions_target_member() {
       Assert::equals($t->property('fixture'), $expected->target());
     }
   }
+
+  #[Test, Runtime(php: '>=8.4')]
+  public function asymmetric_visibility() {
+    $t= $this->declare('{ public private(set) string $fixture; }');
+    Assert::equals(
+      'public private(set) string $name',
+      $t->property('fixture')->toString()
+    );
+  }
 }
\ No newline at end of file