diff --git a/packages/CodeQuality/tests/Rector/If_/ExplicitBoolCompareRector/Fixture/spl_file_info_edge_case.php.inc b/packages/CodeQuality/tests/Rector/If_/ExplicitBoolCompareRector/Fixture/spl_file_info_edge_case.php.inc
index 31aa006ddf3d..89f2826c9df8 100644
--- a/packages/CodeQuality/tests/Rector/If_/ExplicitBoolCompareRector/Fixture/spl_file_info_edge_case.php.inc
+++ b/packages/CodeQuality/tests/Rector/If_/ExplicitBoolCompareRector/Fixture/spl_file_info_edge_case.php.inc
@@ -19,3 +19,29 @@ final class SplFileInfoEdgeCase
         return 1;
     }
 }
+
+?>
+-----
+<?php
+
+namespace Rector\CodeQuality\Tests\Rector\If_\ExplicitBoolCompareRector\Fixture;
+
+use Symfony\Component\Finder\SplFileInfo;
+
+final class SplFileInfoEdgeCase
+{
+    public function run(?SplFileInfo $fileInfo)
+    {
+        if ($fileInfo === null) {
+            return 100;
+        }
+
+        if ($fileInfo->getRealPath() === '') {
+            return 0;
+        }
+
+        return 1;
+    }
+}
+
+?>
diff --git a/packages/Doctrine/src/Rector/ClassMethod/ChangeGetIdTypeToUuidRector.php b/packages/Doctrine/src/Rector/ClassMethod/ChangeGetIdTypeToUuidRector.php
index 415925c8048b..3a2fc00b37be 100644
--- a/packages/Doctrine/src/Rector/ClassMethod/ChangeGetIdTypeToUuidRector.php
+++ b/packages/Doctrine/src/Rector/ClassMethod/ChangeGetIdTypeToUuidRector.php
@@ -44,16 +44,21 @@ public function refactor(Node $node): ?Node
             return null;
         }
 
-        // is already set?
-        if ($node->returnType !== null) {
-            $currentType = $this->getName($node->returnType);
-            if ($currentType === UuidInterface::class) {
-                return null;
-            }
+        if ($this->hasUuidReturnType($node)) {
+            return null;
         }
 
         $node->returnType = new FullyQualified(UuidInterface::class);
 
         return $node;
     }
+
+    private function hasUuidReturnType(Node $node): bool
+    {
+        if ($node->returnType === null) {
+            return false;
+        }
+
+        return $this->isName($node->returnType, UuidInterface::class);
+    }
 }
diff --git a/packages/NodeTypeResolver/src/NodeTypeResolver.php b/packages/NodeTypeResolver/src/NodeTypeResolver.php
index 1e0c4e546567..c40396a736a9 100644
--- a/packages/NodeTypeResolver/src/NodeTypeResolver.php
+++ b/packages/NodeTypeResolver/src/NodeTypeResolver.php
@@ -29,7 +29,6 @@
 use PHPStan\Type\Accessory\HasOffsetType;
 use PHPStan\Type\Accessory\NonEmptyArrayType;
 use PHPStan\Type\ArrayType;
-use PHPStan\Type\Constant\ConstantBooleanType;
 use PHPStan\Type\FloatType;
 use PHPStan\Type\IntegerType;
 use PHPStan\Type\IntersectionType;
@@ -54,7 +53,6 @@
 use Rector\PhpParser\Node\Resolver\NameResolver;
 use Rector\TypeDeclaration\PHPStan\Type\ObjectTypeSpecifier;
 use ReflectionProperty;
-use Symfony\Component\Finder\SplFileInfo;
 
 final class NodeTypeResolver
 {
@@ -200,7 +198,7 @@ public function isStringOrUnionStringOnlyType(Node $node): bool
 
         if ($nodeType instanceof UnionType) {
             foreach ($nodeType->getTypes() as $singleType) {
-                if (! $singleType instanceof StringType) {
+                if ($singleType->isSuperTypeOf(new StringType())->no()) {
                     return false;
                 }
             }
@@ -227,19 +225,10 @@ public function isNullableType(Node $node): bool
     public function isCountableType(Node $node): bool
     {
         $nodeType = $this->getStaticType($node);
-
         $nodeType = $this->pregMatchTypeCorrector->correct($node, $nodeType);
-        if ($nodeType instanceof ObjectType) {
-            if (is_a($nodeType->getClassName(), Countable::class, true)) {
-                return true;
-            }
 
-            // @see https://github.com/rectorphp/rector/issues/2028
-            if (is_a($nodeType->getClassName(), 'SimpleXMLElement', true)) {
-                return true;
-            }
-
-            return is_a($nodeType->getClassName(), 'ResourceBundle', true);
+        if ($this->isCountableObjectType($nodeType)) {
+            return true;
         }
 
         return $this->isArrayType($node);
@@ -280,17 +269,12 @@ public function getStaticType(Node $node): Type
             throw new ShouldNotHappenException('Arg does not have a type, use $arg->value instead');
         }
 
-        if ($node instanceof Param) {
+        if ($node instanceof Param || $node instanceof Scalar) {
             return $this->resolve($node);
         }
 
         /** @var Scope|null $nodeScope */
         $nodeScope = $node->getAttribute(AttributeKey::SCOPE);
-
-        if ($node instanceof Scalar) {
-            return $this->resolve($node);
-        }
-
         if (! $node instanceof Expr || $nodeScope === null) {
             return new MixedType();
         }
@@ -299,14 +283,6 @@ public function getStaticType(Node $node): Type
             return new ObjectWithoutClassType();
         }
 
-        // false type correction of inherited method
-        if ($node instanceof MethodCall && $this->isObjectType($node->var, SplFileInfo::class)) {
-            $methodName = $this->nameResolver->getName($node->name);
-            if ($methodName === 'getRealPath') {
-                return new UnionType([new StringType(), new ConstantBooleanType(false)]);
-            }
-        }
-
         $staticType = $nodeScope->getType($node);
         if (! $staticType instanceof ObjectType) {
             return $staticType;
@@ -334,10 +310,6 @@ public function resolveNodeToPHPStanType(Expr $expr): Type
             return new ArrayType(new MixedType(), new MixedType());
         }
 
-        if ($this->isStringOrUnionStringOnlyType($expr)) {
-            return new StringType();
-        }
-
         return $this->getStaticType($expr);
     }
 
@@ -648,4 +620,22 @@ private function getVendorPropertyFetchType(PropertyFetch $propertyFetch): ?Type
 
         return $this->staticTypeMapper->mapPHPStanPhpDocTypeNodeToPHPStanType($typeNode, new Nop());
     }
+
+    private function isCountableObjectType(Type $type): bool
+    {
+        if (! $type instanceof ObjectType) {
+            return false;
+        }
+
+        if (is_a($type->getClassName(), Countable::class, true)) {
+            return true;
+        }
+
+        // @see https://github.com/rectorphp/rector/issues/2028
+        if (is_a($type->getClassName(), 'SimpleXMLElement', true)) {
+            return true;
+        }
+
+        return is_a($type->getClassName(), 'ResourceBundle', true);
+    }
 }
diff --git a/packages/NodeTypeResolver/src/PerNodeTypeResolver/ScalarTypeResolver.php b/packages/NodeTypeResolver/src/PerNodeTypeResolver/ScalarTypeResolver.php
index 72b6266a9dd2..16fb5d05771d 100644
--- a/packages/NodeTypeResolver/src/PerNodeTypeResolver/ScalarTypeResolver.php
+++ b/packages/NodeTypeResolver/src/PerNodeTypeResolver/ScalarTypeResolver.php
@@ -4,8 +4,8 @@
 
 namespace Rector\NodeTypeResolver\PerNodeTypeResolver;
 
-use PhpParser\Node\Scalar;
 use PhpParser\Node;
+use PhpParser\Node\Scalar;
 use PhpParser\Node\Scalar\DNumber;
 use PhpParser\Node\Scalar\LNumber;
 use PhpParser\Node\Scalar\MagicConst;