From 196117c3f23809393315df505dcd1d5c8b33b6dd Mon Sep 17 00:00:00 2001
From: Kim Alvefur <zash@zash.se>
Date: Sun, 26 Mar 2023 13:07:20 +0200
Subject: util.set: Add a serialization preparation metamethod

Enables util.serialization to turn Sets into a representation that can be
deserialized with an environment trick, i.e. `set{"a","b"}`. Also useful
for debug purposes.
---
 util/set.lua | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/util/set.lua b/util/set.lua
index 69dfef5d..a2704f6c 100644
--- a/util/set.lua
+++ b/util/set.lua
@@ -189,6 +189,15 @@ function set_mt.__tostring(set)
 	return t_concat(s, ", ");
 end
 
+function set_mt.__freeze(set)
+	local s = {};
+	for item in pairs(set._items) do
+		s[#s + 1] = item;
+	end
+	return s;
+end
+
+
 return {
 	new = new;
 	is_set = is_set;
-- 
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