Expand the variable name in the ObjectIdentifier

src/AccessorObjectIdentifier.php

@@ -11,12 +11,12 @@ public function __construct($accessor)
         $this->accessor = $accessor;
     }
 
-    public function getIdentity($obj)
+    public function getIdentity($object)
     {
-        if (!method_exists($obj, $this->accessor)) {
-            throw new \RuntimeException(sprintf('Object of type %s does not have accessor %s', get_class($obj), $this->accessor));
+        if (!method_exists($object, $this->accessor)) {
+            throw new \RuntimeException(sprintf('Object of type %s does not have accessor %s', get_class($object), $this->accessor));
         }
 
-        return $obj->{$this->accessor}();
+        return $object->{$this->accessor}();
     }
 }

src/CallbackObjectIdentifier.php

@@ -11,8 +11,8 @@ public function __construct(callable $callable)
         $this->callable = $callable;
     }
 
-    public function getIdentity($obj)
+    public function getIdentity($object)
     {
-        return call_user_func($this->callable, $obj);
+        return call_user_func($this->callable, $object);
     }
 }

src/ObjectIdentifier.php

@@ -4,5 +4,5 @@
 
 interface ObjectIdentifier
 {
-    public function getIdentity($obj);
+    public function getIdentity($object);
 }