patch 7.4.1154
Problem:    No support for JSON.
Solution:   Add jsonencode() and jsondecode().  Also add v:false, v:true,
            v:null and v:none.
diff --git a/src/proto/json.pro b/src/proto/json.pro
new file mode 100644
index 0000000..6920f51
--- /dev/null
+++ b/src/proto/json.pro
@@ -0,0 +1,5 @@
+/* json.c */
+char_u *json_encode(typval_T *val);
+void json_encode_item(garray_T *gap, typval_T *val, int copyID);
+void json_decode(js_read_T *reader, typval_T *res);
+/* vim: set ft=c : */