patch 7.4.1992
Problem:    Values for true and false can be confusing.
Solution:   Update the documentation.  Add a test.  Make v:true evaluate to
            TRUE for a non-zero-arg.
diff --git a/src/Makefile b/src/Makefile
index 4deb4a2..6add935 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -2068,11 +2068,12 @@
 	test_statusline \
 	test_syn_attr \
 	test_syntax \
-	test_usercommands \
 	test_tabline \
 	test_tagjump \
 	test_timers \
+	test_true_false \
 	test_undolevels \
+	test_usercommands \
 	test_unlet \
 	test_viminfo \
 	test_viml \