fix: use serialize/unserialize for cache to prevent __set_state crashes

src/Support/Cache.php

@@ -15,7 +15,7 @@ final class Cache
     /**
      * The cache version.
      */
-    private const string CACHE_VERSION = 'v3';
+    private const string CACHE_VERSION = 'v4';
 
     /**
      * The cache instance.
@@ -138,7 +138,7 @@ public function persist(string $file, array $values): void
 
             $cache[$fileHash] = $values;
 
-            $content = '<?php return '.var_export($cache, true).';';
+            $content = '<?php return unserialize('.var_export(serialize($cache), true).');';
 
             if (file_put_contents($filePath, $content) !== false) {
                 chmod($filePath, 0666);

tests/Support/Cache.php

@@ -0,0 +1,41 @@
+<?php
+
+use Pest\TypeCoverage\Support\Cache;
+use PHPStan\Analyser\Error;
+
+beforeEach(function () {
+    $this->cache = Cache::instance();
+    $this->cache->flush();
+});
+
+afterEach(function () {
+    $this->cache->flush();
+});
+
+test('it persists and retrieves cached results', function () {
+    $file = __DIR__.'/../Fixtures/All.php';
+    $error = new Error('Test error', $file, 10);
+
+    $this->cache->persist($file, [$file, [$error], []]);
+
+    expect($this->cache->has($file))->toBeTrue()
+        ->and($this->cache->get($file))->toBeArray()
+        ->and($this->cache->get($file)[0])->toBe($file)
+        ->and($this->cache->get($file)[1])->toHaveCount(1)
+        ->and($this->cache->get($file)[1][0])->toBeInstanceOf(Error::class)
+        ->and($this->cache->get($file)[1][0]->getMessage())->toBe('Test error');
+});
+
+test('it persists and retrieves errors containing PhpParser node metadata', function () {
+    $file = __DIR__.'/../Fixtures/All.php';
+    $nodeName = new PhpParser\Node\Name('Tests\Fixtures\All');
+    $error = new Error('Type mismatch', $file, 10, metadata: ['type' => $nodeName]);
+
+    $this->cache->persist($file, [$file, [$error], []]);
+
+    $cached = $this->cache->get($file);
+
+    expect($cached[1])->toHaveCount(1)
+        ->and($cached[1][0])->toBeInstanceOf(Error::class)
+        ->and($cached[1][0]->getMessage())->toBe('Type mismatch');
+});