Update ObjectShape native type

src/Type/ObjectShapePropertyReflection.php

@@ -61,12 +61,12 @@ public function getPhpDocType(): Type
 
 	public function hasNativeType(): bool
 	{
-		return false;
+		return true;
 	}
 
 	public function getNativeType(): Type
 	{
-		return new MixedType();
+		return $this->type;
 	}
 
 	public function getReadableType(): Type

tests/PHPStan/Rules/Comparison/StrictComparisonOfDifferentTypesRuleTest.php

@@ -1019,6 +1019,16 @@ public function testBug10884(): void
 		$this->analyse([__DIR__ . '/data/bug-10884.php'], []);
 	}
 
+	public function testBug11609(): void
+	{
+		$this->analyse([__DIR__ . '/data/bug-11609.php'], [
+			[
+				'Strict comparison using !== between string and null will always evaluate to true.',
+				16,
+			],
+		]);
+	}
+
 	public function testBug3761(): void
 	{
 		$this->analyse([__DIR__ . '/data/bug-3761.php'], []);

tests/PHPStan/Rules/Comparison/data/bug-11609.php

@@ -0,0 +1,20 @@
+<?php declare(strict_types = 1);
+
+namespace Bug11609;
+
+class HelloWorld
+{
+	/** @param object{hello: string, world?: string} $a */
+	public function sayHello(object $a, string $b): void
+	{
+		if ($a->hello !== null) { // should report notIdentical.alwaysTrue
+			echo 'hello';
+		}
+		if (isset($a->world)) { // shouldn't report any error
+			echo 'world';
+		}
+		if ($b !== null) {
+			echo 'b';
+		}
+	}
+}