# HG changeset patch
# User Kim Alvefur <zash@zash.se>
# Date 1679828840 -7200
# Node ID 895a82c5d8d47811cc430e25716ef51b013af58e
# Parent  c0e3e0d79574a7bd0561456a77a670b8fa48ea92
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.

diff -r c0e3e0d79574 -r 895a82c5d8d4 util/set.lua
--- a/util/set.lua	Sun Mar 26 00:49:25 2023 +0100
+++ b/util/set.lua	Sun Mar 26 13:07:20 2023 +0200
@@ -189,6 +189,15 @@
 	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;