From bf3ebf6679e8b5e7b443c5924e8aa2afcb66a3e8 Mon Sep 17 00:00:00 2001
From: rxi <rxi@users.noreply.github.com>
Date: Sun, 6 Sep 2015 14:07:28 +0100
Subject: [PATCH] Added argument type-checking to json.decode()

---
 json.lua | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/json.lua b/json.lua
index 16c232d..0f724d5 100644
--- a/json.lua
+++ b/json.lua
@@ -370,6 +370,9 @@ end
 
 
 function json.decode(str)
+  if type(str) ~= "string" then
+    error("expected argument of type string, got " .. type(str))
+  end
   return ( parse(str, next_char(str, 1, space_chars, true)) )
 end