[Ecls-list] Request for few examples and informations

[meh.]

All the questions except one got answered by EQL's sources.

The question that remains is, is there a way to just pass the va_list
to a funcall like function or is there a way to know a function's
arity?

And is there a way to not go to a shell when an error occurs during
the load of a script?

Is there a way to convert a cl_object to a C bool?

Thanks in advance.