diff --git a/src/Spies/Helpers.php b/src/Spies/Helpers.php
index f2e0b01..10d39dc 100644
--- a/src/Spies/Helpers.php
+++ b/src/Spies/Helpers.php
@@ -28,28 +28,9 @@ private static function do_vals_match( $a, $b ) {
 		if ( $a === $b ) {
 			return true;
 		}
-		if ( is_object( $a ) || is_object( $b ) ) {
-			$array_a = is_object( $a ) ? (array) $a : $a;
-			$array_b = is_object( $b ) ? (array) $b : $b;
-			if ( $array_a === $array_b ) {
-				return true;
-			}
-		}
 		if ( $a instanceof \Spies\AnyValue || $b instanceof \Spies\AnyValue ) {
 			return true;
 		}
 		return false;
 	}
-
-	public static function array_clone( $array ) {
-		return array_map( function( $element ) {
-			return ( ( is_array( $element ) )
-				? Helpers::array_clone( $element )
-				: ( ( is_object( $element ) )
-				? clone $element
-				: $element
-			)
-		);
-		}, $array );
-	}
 }
diff --git a/src/Spies/Spy.php b/src/Spies/Spy.php
index b6aa56d..f584f6d 100644
--- a/src/Spies/Spy.php
+++ b/src/Spies/Spy.php
@@ -367,8 +367,7 @@ private function set_arguments( $args ) {
 	 *
 	 * You should not need to call this directly.
 	 */
-	private function record_function_call( $orig_args ) {
-		$args = Helpers::array_clone( $orig_args );
+	private function record_function_call( $args ) {
 		$this->call_record[] = new SpyCall( $args );
 	}
 
diff --git a/tests/SpyTest.php b/tests/SpyTest.php
index 5105613..4166dec 100644
--- a/tests/SpyTest.php
+++ b/tests/SpyTest.php
@@ -118,6 +118,13 @@ public function test_spy_was_called_with_returns_true_if_the_spy_was_called_with
 		$this->assertTrue( $spy->was_called_with( $obj ) );
 	}
 
+	public function test_spy_was_called_with_returns_true_if_the_spy_was_called_with_the_deep_object_arguments_provided() {
+		$spy = \Spies\make_spy();
+		$obj = [ (object) [ 'ID' => 5, 'names' => [ 'bob' ], 'colors' => [ 'red' => '#f00' ] ] ];
+		$spy( [ 'foo' => $obj[0] ] );
+		$this->assertTrue( $spy->was_called_with( [ 'foo' => $obj[0] ] ) );
+	}
+
 	public function test_spy_was_called_with_returns_false_if_the_spy_was_not_called_with_the_arguments_provided() {
 		$spy = \Spies\make_spy();
 		$spy( 'foo' );
@@ -153,14 +160,24 @@ public function test_spy_was_called_when_returns_false_if_the_spy_was_called_whe
 		} ) );
 	}
 
-	public function test_spy_was_called_when_uses_a_copy_of_the_arguments_as_they_were_when_the_call_occurred() {
+	public function test_spy_was_called_when_tests_object_arguments_by_reference() {
 		$spy = \Spies\make_spy();
 		$obj = new \StdClass();
 		$obj->foo = 'original';
 		$spy( $obj );
 		$obj->foo = 'modified';
 		$this->assertTrue( $spy->was_called_when( function( $args ) {
-			return $args[0]->foo === 'original';
+			return $args[0]->foo === 'modified';
+		} ) );
+	}
+
+	public function test_spy_was_called_when_tests_array_arguments_by_value() {
+		$spy = \Spies\make_spy();
+		$obj = [ 'foo' => 'original' ];
+		$spy( $obj );
+		$obj['foo'] = 'modified';
+		$this->assertTrue( $spy->was_called_when( function( $args ) {
+			return $args[0]['foo'] === 'original';
 		} ) );
 	}