patch 7.4.1341
Problem:    It's difficult to add more arguments to ch_sendraw() and
            ch_sendexpr().
Solution:   Make the third option a dictionary.
diff --git a/src/os_win32.c b/src/os_win32.c
index eaa8ba5..63d7d60 100644
--- a/src/os_win32.c
+++ b/src/os_win32.c
@@ -5125,7 +5125,7 @@
     job->jv_channel = channel;
     channel_set_pipes(channel, (sock_T)ifd[1], (sock_T)ofd[0], (sock_T)efd[0]);
     channel_set_job(channel, job);
-    channel_set_mode(channel, options->jo_mode);
+    channel_set_options(channel, options);
 
 #   ifdef FEAT_GUI
      channel_gui_register(channel);