Regression test

Closes phpstan/phpstan#3357

tests/PHPStan/Rules/Comparison/StrictComparisonOfDifferentTypesRuleTest.php

@@ -450,4 +450,10 @@ public function testBug1707(): void
 		$this->analyse([__DIR__ . '/data/bug-1707.php'], []);
 	}
 
+	public function testBug3357(): void
+	{
+		$this->checkAlwaysTrueStrictComparison = true;
+		$this->analyse([__DIR__ . '/data/bug-3357.php'], []);
+	}
+
 }

tests/PHPStan/Rules/Comparison/data/bug-3357.php

@@ -0,0 +1,21 @@
+<?php
+
+namespace Bug3357;
+
+function (): void {
+	/**
+	 * @var array{foo?: string}
+	 */
+	$foo = [];
+
+	assert($foo === []);
+};
+
+function (): void {
+	/**
+	 * @var array{foo: string, bar?: string}
+	 */
+	$foo = ['foo' => ''];
+
+	assert($foo === ['foo' => '']);
+};