add warning about sscanf

proxy_lua.c

@@ -49,6 +49,11 @@ static void _mcplib_append_section_stats(const char *key, const uint16_t klen,
     // table must be at the top when this function is called.
     int tidx = lua_absindex(L, -1);
 
+    // NOTE: sscanf is not great, especially with numerics due to UD for out
+    // of range data. It is safe to use here because we're generating the
+    // strings, and we don't use this function on anything that has user
+    // defined data (ie; stats proxy). Otherwise sscanf saves a lot of code so
+    // we use it here.
     if (sscanf(key, "items:%ld:%s", &section, stat) == 2
             || sscanf(key, "%ld:%s", &section, stat) == 2) {
         // stats [items, slabs, conns]