[asdf-devel] problems defining a new component class

I'm finding that for some reason the :default-initargs to a new component class (a subclass of cl-source-file) I've defined are not getting applied. I have a vague memory that there's some weirdness in the way asdf creates components that means that this doesn't work, but I'd be obliged if anyone could provide more guidance. In particular, I would be very grateful for any suggested workaround if, as I suspect, this is something that ASDF simply won't let me do. many thanks, r