patch 8.2.4634: Vim9: cannot initialize a variable to null_list
Problem: Vim9: cannot initialize a variable to null_list.
Solution: Give negative count to NEWLIST. (closes #10027)
Also fix inconsistencies in comparing with null values.
diff --git a/src/vim9.h b/src/vim9.h
index ed5f676..60c54d9 100644
--- a/src/vim9.h
+++ b/src/vim9.h
@@ -90,7 +90,9 @@
ISN_PUSHCHANNEL, // push NULL channel
ISN_PUSHJOB, // push NULL job
ISN_NEWLIST, // push list from stack items, size is isn_arg.number
+ // -1 for null_list
ISN_NEWDICT, // push dict from stack items, size is isn_arg.number
+ // -1 for null_dict
ISN_NEWPARTIAL, // push NULL partial
ISN_AUTOLOAD, // get item from autoload import, function or variable