Create instance of enum from same enum in constructor

It will prevent incorrect semantic exception message

src/Enum.php

@@ -40,6 +40,12 @@ abstract class Enum implements \JsonSerializable
      */
     public function __construct($value)
     {
+        if ($value instanceof static) {
+            $this->value = $value->getValue();
+
+            return;
+        }
+
         if (!$this->isValid($value)) {
             throw new \UnexpectedValueException("Value '$value' is not part of the enum " . \get_called_class());
         }

tests/EnumTest.php

@@ -281,6 +281,15 @@ public function testBooleanEnum()
         $this->assertFalse((new EnumFixture(EnumFixture::PROBLEMATIC_BOOLEAN_FALSE))->jsonSerialize());
     }
 
+    public function testConstructWithSameEnumArgument()
+    {
+        $enum = new EnumFixture(EnumFixture::FOO);
+
+        $enveloped = new EnumFixture($enum);
+
+        $this->assertEquals($enum, $enveloped);
+    }
+
     private function assertJsonEqualsJson($json1, $json2)
     {
         $this->assertJsonStringEqualsJsonString($json1, $json2);