fix union types

Author: staabm

src/Analyser/TypeSpecifier.php

@@ -1589,7 +1589,6 @@ private function getConditionalSpecifiedTypes(
 				$argumentExpr instanceof Node\Scalar
 				|| ($argumentExpr instanceof ConstFetch && in_array(strtolower($argumentExpr->name->toString()), ['true', 'false', 'null'], true))
 			)
-			&& $targetType->isConstantScalarValue()->yes()
 		) {
 			return null;
 		}

tests/PHPStan/Rules/Comparison/ImpossibleCheckTypeFunctionCallRuleTest.php

@@ -74,14 +74,6 @@ public function testImpossibleCheckTypeFunctionCall(): void
 					'Call to function is_callable() with \'nonexistentFunction\' will always evaluate to false.',
 					87,
 				],
-				[
-					'Call to function is_numeric() with \'123\' will always evaluate to true.',
-					102,
-				],
-				[
-					'Call to function is_numeric() with \'blabla\' will always evaluate to false.',
-					105,
-				],
 				[
 					'Call to function is_numeric() with 123|float will always evaluate to true.',
 					118,
@@ -231,19 +223,11 @@ public function testImpossibleCheckTypeFunctionCall(): void
 					718,
 					'Because the type is coming from a PHPDoc, you can turn off this check by setting <fg=cyan>treatPhpDocTypesAsCertain: false</> in your <fg=cyan>%configurationFile%</>.',
 				],
-				[
-					'Call to function is_numeric() with \'123\' will always evaluate to true.',
-					718,
-				],
 				[
 					'Call to function assert() with false will always evaluate to false.',
 					719,
 					'Because the type is coming from a PHPDoc, you can turn off this check by setting <fg=cyan>treatPhpDocTypesAsCertain: false</> in your <fg=cyan>%configurationFile%</>.',
 				],
-				[
-					'Call to function is_numeric() with \'blabla\' will always evaluate to false.',
-					719,
-				],
 				[
 					'Call to function assert() with true will always evaluate to true.',
 					726,
@@ -1182,7 +1166,12 @@ public function testBug14177(): void
 	public function testBug13566(): void
 	{
 		$this->treatPhpDocTypesAsCertain = true;
-		$this->analyse([__DIR__ . '/data/bug-13566.php'], []);
+		$this->analyse([__DIR__ . '/data/bug-13566.php'], [
+			[
+				'Call to function is_numeric() with 123 will always evaluate to true.',
+				197,
+			],
+		]);
 	}
 
 }

tests/PHPStan/Rules/Comparison/data/bug-13566.php

@@ -1,4 +1,6 @@
-<?php declare(strict_types = 1);
+<?php // lint >= 8.0
+
+declare(strict_types = 1);
 
 namespace Bug13566;
 
@@ -165,5 +167,32 @@ function test(): void
 {
 	// send 404 header
 	notFound(false);
+}
+
+
+class ReturnViaUnion
+{
+	/**
+	 * @return ($exit is int ? void : never)
+	 */
+	public static function notFound(int|string $exit = 'hello world'): void
+	{
+		header('HTTP/1.1 404 Not Found', true, 404);
+
+		if (!is_int($exit)) {
+			echo '404 Not Found';
+			exit;
+		}
+	}
+
+	public function test(): void
+	{
+		// send 404 header
+		self::notFound(0);
+	}
+}
+
 
+$x = 123;
+if (is_numeric($x)) {
 }