Fix method equals is incorrect working

src/Enum.php

@@ -82,7 +82,7 @@ public function __toString()
      */
     final public function equals(Enum $enum)
     {
-        return $this->getValue() === $enum->getValue();
+        return $this->getValue() === $enum->getValue() && get_called_class() == get_class($enum);
     }
 
     /**

tests/EnumConflict.php

@@ -0,0 +1,23 @@
+<?php
+/**
+ * @link    http://github.com/myclabs/php-enum
+ * @license http://www.opensource.org/licenses/mit-license.php MIT (see the LICENSE file)
+ */
+namespace MyCLabs\Tests\Enum;
+
+use MyCLabs\Enum\Enum;
+
+/**
+ * Class EnumConflict
+ *
+ * @method static EnumConflict FOO()
+ * @method static EnumConflict BAR()
+ *
+ * @author Daniel Costa <[email protected]>
+ * @author Mirosław Filip <[email protected]>
+ */
+class EnumConflict extends Enum
+{
+    const FOO = "foo";
+    const BAR = "bar";
+}

tests/EnumTest.php

@@ -242,4 +242,12 @@ public function testEqualsComparesProblematicValuesProperly()
         $this->assertFalse($emptyString->equals($null));
         $this->assertFalse($null->equals($false));
     }
+
+    /**
+     * equals()
+     */
+    public function testEqualsConflictValues()
+    {
+        $this->assertFalse(EnumFixture::FOO()->equals(EnumConflict::FOO()));
+    }
 }