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

Fixes [Bug #16850]
---
 hash.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/hash.c b/hash.c
index e75a431c09..b7d320f7c2 100644
--- a/hash.c
+++ b/hash.c
@@ -315,6 +315,9 @@ objid_hash(VALUE obj)
  * 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
  *++