Function pxs_newfactory 

#[unsafe(no_mangle)]
pub extern "C" fn pxs_newfactory(
    func: pxs_Func,
    args: *mut pxs_Var,
) -> pxs_VarT

Add a factory variable. This variable will be instantiated once at module startup.

Args should not contain runtime. It gets added automatically.

Basically does:

var_name = callback(args)