https://git.ruby-lang.org/ruby.git/commit/?id=de29a022ac

From de29a022acb93691dfc50db852cb04f763565072 Mon Sep 17 00:00:00 2001
From: Jeremy Evans <code@j...>
Date: Tue, 12 May 2020 18:01:16 -0700
Subject: Document that #hash is not called for certain core classes [ci skip]

Fixes [Bug #16850]

diff --git a/hash.c b/hash.c
index e75a431..b7d320f 100644
--- a/hash.c
+++ b/hash.c
@@ -315,6 +315,9 @@ objid_hash(VALUE obj) https://github.com/ruby/ruby/blob/trunk/hash.c#L315
  * implementations of Ruby.  If you need a stable identifier across Ruby
  * invocations and implementations you will need to generate one with a custom
  * method.
+ *
+ * Certain core classes such as Integer use built-in hash calculations and
+ * do not call the #hash method when used as a hash key.
  *--
  * \private
  *++
-- 
cgit v0.10.2


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