--- a/src/lib/Utils.luan	Sat Aug 09 09:31:28 2025 +0900
+++ b/src/lib/Utils.luan	Sun Aug 10 06:25:35 2025 +0900
@@ -1,6 +1,7 @@
 local Luan = require "luan:Luan.luan"
 local error = Luan.error
 local pairs = Luan.pairs or error()
+local type = Luan.type or error()
 local Http = require "luan:http/Http.luan"
 
 
@@ -19,6 +20,27 @@
 	return rtn
 end
 
+local function deep_copy2(v,map)
+	if type(v) ~= "table" then
+		return v
+	end
+	local v2 = map[v]
+	if v2 ~= nil then
+		return v2
+	end
+	local t = {}
+	map[v] = t
+	for key, val in pairs(v) do
+		t[deep_copy2(key,map)] = deep_copy2(val,map)
+	end
+	return t
+end
+
+local function deep_copy(v)
+	return deep_copy2(v,{})
+end
+Utils.deep_copy = deep_copy
+
 --[[
 function Utils.get_first(t)
 	return pairs(t)()