Change to clone argument objects

Unwrapper.php

<?php

class Unwrapper implements RevealerInterface
{
    // ...

    /**
     * @param mixed $argument
     *
     * @return mixed
     */
    public function unwrapOne($argument)
    {
        // ...

        if ($argument instanceof ProphecyInterface) {
            $argument = $argument->reveal();
        }

        // Adding this bit!
        $r = new \ReflectionObject($argument);
        if ($r->isCloneable()) {
            $argument = clone $argument;
        }

        return $argument;
    }
    
    //...
}

Having tried this against the PHPSpec tests, it appears to only break one test…

spec/PhpSpec/Exception/ExceptionFactorySpec::85 - it creates a property not found exception