From f60028e45fe15e075cbdd285d68c6e3833b94b7a Mon Sep 17 00:00:00 2001
From: Filippo Tessarotto <zoeslam@gmail.com>
Date: Thu, 17 Feb 2022 16:06:11 +0100
Subject: [PATCH 1/4] Keep PHP 8.1 enums as is

---
 fixtures/f012/Suit.php              | 11 +++++++++++
 src/DeepCopy/DeepCopy.php           |  5 +++++
 tests/DeepCopyTest/DeepCopyTest.php | 13 +++++++++++++
 3 files changed, 29 insertions(+)
 create mode 100644 fixtures/f012/Suit.php

diff --git a/fixtures/f012/Suit.php b/fixtures/f012/Suit.php
new file mode 100644
index 0000000..9d77ddb
--- /dev/null
+++ b/fixtures/f012/Suit.php
@@ -0,0 +1,11 @@
+<?php declare(strict_types=1);
+
+namespace DeepCopy\f012;
+
+enum Suit: string
+{
+    case Hearts = 'Hearts';
+    case Diamonds = 'Diamonds';
+    case Clubs = 'Clubs';
+    case Spades = 'Spades';
+}
diff --git a/src/DeepCopy/DeepCopy.php b/src/DeepCopy/DeepCopy.php
index 15e5c68..863c0ca 100644
--- a/src/DeepCopy/DeepCopy.php
+++ b/src/DeepCopy/DeepCopy.php
@@ -140,6 +140,11 @@ private function recursiveCopy($var)
             return $var;
         }
 
+        // PHP 8.1 Enum
+        if (function_exists('enum_exists') && enum_exists($var::class)) {
+            return $var;
+        }
+
         // Object
         return $this->copyObject($var);
     }
diff --git a/tests/DeepCopyTest/DeepCopyTest.php b/tests/DeepCopyTest/DeepCopyTest.php
index a079c23..8d11c5b 100644
--- a/tests/DeepCopyTest/DeepCopyTest.php
+++ b/tests/DeepCopyTest/DeepCopyTest.php
@@ -19,6 +19,7 @@
 use DeepCopy\f008;
 use DeepCopy\f009;
 use DeepCopy\f011;
+use DeepCopy\f012\Suit;
 use DeepCopy\Filter\KeepFilter;
 use DeepCopy\Filter\SetNullFilter;
 use DeepCopy\Matcher\PropertyNameMatcher;
@@ -495,6 +496,18 @@ public function test_it_ignores_uninitialized_typed_properties()
         $this->assertFalse(isset($copy->foo));
     }
 
+    /**
+     * @requires PHP 8.1
+     */
+    public function test_it_keeps_enums()
+    {
+        $enum = Suit::Clubs;
+
+        $copy = (new DeepCopy())->copy($enum);
+
+        $this->assertSame($enum, $copy);
+    }
+
     private function assertEqualButNotSame($expected, $val)
     {
         $this->assertEquals($expected, $val);

From c78e0516c19a72dd75aa258d55c1ede43b1ed9c2 Mon Sep 17 00:00:00 2001
From: Filippo Tessarotto <zoeslam@gmail.com>
Date: Fri, 18 Feb 2022 08:26:49 +0100
Subject: [PATCH 2/4] enum_exists may have been manually declared on lower PHP
 versions, use strict PHP version check

---
 src/DeepCopy/DeepCopy.php | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/DeepCopy/DeepCopy.php b/src/DeepCopy/DeepCopy.php
index 863c0ca..678df40 100644
--- a/src/DeepCopy/DeepCopy.php
+++ b/src/DeepCopy/DeepCopy.php
@@ -140,8 +140,8 @@ private function recursiveCopy($var)
             return $var;
         }
 
-        // PHP 8.1 Enum
-        if (function_exists('enum_exists') && enum_exists($var::class)) {
+        // Enum
+        if (PHP_VERSION_ID >= 80100 && enum_exists($var::class)) {
             return $var;
         }
 

From fe20811c6c719a4d5616755dd7feb7ae7a5c8bb0 Mon Sep 17 00:00:00 2001
From: Filippo Tessarotto <zoeslam@gmail.com>
Date: Thu, 3 Mar 2022 09:17:33 +0100
Subject: [PATCH 3/4] Backward compatibility

---
 src/DeepCopy/DeepCopy.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/DeepCopy/DeepCopy.php b/src/DeepCopy/DeepCopy.php
index 678df40..9aeea6d 100644
--- a/src/DeepCopy/DeepCopy.php
+++ b/src/DeepCopy/DeepCopy.php
@@ -141,7 +141,7 @@ private function recursiveCopy($var)
         }
 
         // Enum
-        if (PHP_VERSION_ID >= 80100 && enum_exists($var::class)) {
+        if (PHP_VERSION_ID >= 80100 && is_object($var) && enum_exists(get_class($var))) {
             return $var;
         }
 

From 07364389e116387a81545f31854da87ebcff5b0e Mon Sep 17 00:00:00 2001
From: Filippo Tessarotto <zoeslam@gmail.com>
Date: Thu, 3 Mar 2022 09:18:48 +0100
Subject: [PATCH 4/4] Remove redundant check

---
 src/DeepCopy/DeepCopy.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/DeepCopy/DeepCopy.php b/src/DeepCopy/DeepCopy.php
index 9aeea6d..5e68c64 100644
--- a/src/DeepCopy/DeepCopy.php
+++ b/src/DeepCopy/DeepCopy.php
@@ -141,7 +141,7 @@ private function recursiveCopy($var)
         }
 
         // Enum
-        if (PHP_VERSION_ID >= 80100 && is_object($var) && enum_exists(get_class($var))) {
+        if (PHP_VERSION_ID >= 80100 && enum_exists(get_class($var))) {
             return $var;
         }