object->exact-type-retval used by ffi/define-foreign-interface doesn't support void return type

[tristanstraub]

dtype-next/src/tech/v3/datatype/ffi/base.clj

Line 301 in d3fb80b

(defn object->exact-type-retval

I tried defining the following but could not compile it due to the case not supporting "void":

(def comp-iface-def (ffi/define-foreign-interface :void [:int32 :pointer]))

Adding the following to "object->exact-type-retval" appears to work as expected, with the callback from c -> clojure happening without issues:

:void [[:return]]

[tristanstraub]

I have used ":pointer?" as a return type to work around this. Is this the intent?

[cnuernber]

This is a real issue for sure. Void means nothing is popped off the C stack which is key to indicate. Thanks for the issue.