Fix false-positive: Method never returns XX so it can be removed from the return type

Author: staabm

src/Rules/TooWideTypehints/TooWideFunctionReturnTypehintRule.php

@@ -64,6 +64,13 @@ public function processNode(Node $node, Scope $scope): array
 
 		$returnType = TypeCombinator::union(...$returnTypes);
 
+		if (
+			$returnType->isConstantScalarValue()->yes()
+			&& $functionReturnType->isConstantScalarValue()->yes()
+		) {
+			return [];
+		}
+
 		$messages = [];
 		foreach ($functionReturnType->getTypes() as $type) {
 			if (!$type->isSuperTypeOf($returnType)->no()) {

src/Rules/TooWideTypehints/TooWideMethodReturnTypehintRule.php

@@ -86,6 +86,14 @@ public function processNode(Node $node, Scope $scope): array
 		}
 
 		$returnType = TypeCombinator::union(...$returnTypes);
+
+		if (
+			$returnType->isConstantScalarValue()->yes()
+			&& $methodReturnType->isConstantScalarValue()->yes()
+		) {
+			return [];
+		}
+
 		if (
 			!$isFirstDeclaration
 			&& !$method->isPrivate()