commit https://github.com/vim/vim/commit/595e64e259faefb330866852e1b9f6168544572a Author: Bram Moolenaar <Bram@vim.org> Date: Sun Feb 7 19:19:53 2016 +0100 patch 7.4.1279 Problem: jsonencode() is not producing strict JSON. Solution: Add jsencode() and jsdecode(). Make jsonencode() and jsondecode() strict.

--- a/src/structs.h
+++ b/src/structs.h
@@ -2728,3 +2728,11 @@ struct js_reader
     void	*js_cookie;	/* can be used by js_fill */
 };
 typedef struct js_reader js_read_T;
+
+/* mode for a channel */
+typedef enum
+{
+    MODE_RAW = 0,
+    MODE_JSON,
+    MODE_JS
+} ch_mode_T;