Save SpyCall object arguments by reference

Reverts changes made in [v1.4.1](92de74c) and [v1.5.1](b3ee2e2) as I think I was wrong to copy objects. Objects are passed by reference and should be treated that way by Spies. Unexpected mutations are part of the language and should be considered while writing tests.

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 );
-	}
 }

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 );
 	}