From c0397a7bf77a15b6dedb06d3ad5ad4a33da59ca3 Mon Sep 17 00:00:00 2001
From: Bruce Hill <bitbucket@bruce-hill.com>
Date: Mon, 12 Feb 2018 22:02:13 -0800
Subject: [PATCH] Updated readme.

---
 README.md | 12 ++++--------
 1 file changed, 4 insertions(+), 8 deletions(-)

diff --git a/README.md b/README.md
index bf52281..dc1b907 100644
--- a/README.md
+++ b/README.md
@@ -99,28 +99,23 @@ function immutable(fields, class_fields)
         __index = function(self, key)
             local cls = getmetatable(self)
             if cls.indices[key] then
-                local data = cls.__instances[extract_hash(self)]
+                local data = cls.__instances[extract_hash(self)][self]
                 return data[cls.indices[key]]
             else
                 return cls[key]
             end
         end,
-        __gc = function(self)
-            local __instances = getmetatable(self).__instances
-            local hash = extract_hash(self)
-            __instances[hash][self] = nil
-            if not next(__instances[hash]) then __instances[hash] = nil end
-        end,
         -- also: __len, __pairs, __ipairs, __tostring, from_table, is_instance
     }
     for k,v in pairs(class_fields) do cls[k] = v end
     cls.__fields, cls.__indices = fields, {}
     for i,f in ipairs(fields) do cls.__indices[f] = i end
-    cls.__instances = setmetatable({}, {__index=function(self, key)
+    cls.__instances = setmetatable({}, {__mode='v', __index=function(self, key)
         local bucket = setmetatable({}, {__mode='k'})
         self[key] = bucket
         return bucket
     end})
+    cls.__buckets = setmetatable({}, {__mode='k'})
     return setmetatable(cls, {
         __call=function(cls, ...)
             local hash = make_hash(...)
@@ -136,6 +131,7 @@ function immutable(fields, class_fields)
                 if match then return userdata end
             end
             local userdata = setmetatable(new_userdata(hash), cls)
+            cls.__buckets[userdata] = bucket
             bucket[userdata] = {...}
             return userdata
         end