The HttpFoundation Cookie class accepts the value of the cookie but PHP will URL-encode the value when using the setcookie() function. This happens in the Response class:
https://github.com/symfony/HttpFoundation/blob/master/Response.php#L348

It would be nice if the Cookie class gave the option to not URL-encode the value. I'm working with a 3rd party application that I need to have use the same cookie, but it can't because it doesn't expect the value to be URL-encoded. This forces me to set the cookie using setrawcookie() outside of the framework.

I imagine the constructor for the Cookie class could have a "do url-encoding" parameter, defaulted to true. When set to false, the Response class could conditionally use setrawcookie() instead of setcookie().