Fix

Author: VincentLanglet

e2e/bug-10483/bug-10483.php

@@ -2,6 +2,9 @@
 
 define("FILTER_VALIDATE_FLOAT",false);
 
+/** @return mixed */
+function doFoo() { return null; }
+
 $mixed = doFoo();
 if (filter_var($mixed, FILTER_VALIDATE_BOOLEAN)) {
 }

src/Type/Php/FilterFunctionReturnTypeHelper.php

@@ -105,7 +105,7 @@ public function getType(Type $inputType, ?Type $filterType, ?Type $flagsType): T
 
 		if ($filterType === null) {
 			$filterValue = $this->getConstant('FILTER_DEFAULT');
-			if (null === $filterValue) {
+			if ($filterValue === null) {
 				return $mixedType;
 			}
 		} else {
@@ -442,7 +442,7 @@ private function getOptions(Type $flagsType, int $filterValue): array
 	private function hasFlag(string $flagName, ?Type $flagsType): bool
 	{
 		$flag = $this->getConstant($flagName);
-		if (null === $flag) {
+		if ($flag === null) {
 			return false;
 		}