Problem cron event with arguments

Hi,
I have a problem with your plugin when I try to create a new cron event with arguments.
I did a test with your exemple [“i”,”want”,25,”cakes”] in arguments and in my function I call them with myfunction($a,$b,$c,$d). But if I try to echo each of theses params, there is only the first one that is corretly return, the others are empty.
I don’t know if I call the arguments properly.
Thanks,