From dc2f524d29b7893eaa4f89e1b8d07674b243ab19 Mon Sep 17 00:00:00 2001
From: Bruce Hill <bitbucket@bruce-hill.com>
Date: Mon, 23 Apr 2018 16:46:58 -0700
Subject: [PATCH] Updated to include info about __hash.

---
 README.md         | 3 +--
 implementation.md | 2 +-
 2 files changed, 2 insertions(+), 3 deletions(-)

diff --git a/README.md b/README.md
index 4009b80..63f5b30 100644
--- a/README.md
+++ b/README.md
@@ -95,8 +95,7 @@ If you override `__index` instead of `__missing`, the function you provide will
 
 The library also defines a `__hash` metamethod that returns the hash value used internally for instances. Overriding this value does not affect the underlying implementation, but you may find it useful for overriding `__index`:
 ```lua
-local Foo
-Foo = immutable({"x","y"}, {
+local Foo = immutable({"x","y"}, {
     classvar = 23,
     __index = function(self, key)
         local cls = getmetatable(self)
diff --git a/implementation.md b/implementation.md
index e3495d3..57da736 100644
--- a/implementation.md
+++ b/implementation.md
@@ -6,7 +6,7 @@ function immutable(fields, class_fields)
         __index = function(self, key)
             local cls = getmetatable(self)
             key = cls.__indices[key] or key
-            local data = cls.__instances[extract_hash(self)][self]
+            local data = cls.__instances[cls.__hash(self)][self]
             return data[key] or cls[key]
         end,
         ...also: __len, __pairs, __ipairs, __tostring, from_table, is_instance...