https://git.ruby-lang.org/ruby.git/commit/?id=790a1b1790

From 790a1b17902f7ccb5939b9e0314571079fc30bc8 Mon Sep 17 00:00:00 2001
From: Aaron Patterson <tenderlove@r...>
Date: Thu, 30 May 2019 15:25:31 -0700
Subject: object id is stable now for all objects, so we can let hash keys move


diff --git a/gc.c b/gc.c
index bb07d3f..5a94ca0 100644
--- a/gc.c
+++ b/gc.c
@@ -4542,12 +4542,7 @@ mark_keyvalue(st_data_t key, st_data_t value, st_data_t data) https://github.com/ruby/ruby/blob/trunk/gc.c#L4542
 {
     rb_objspace_t *objspace = (rb_objspace_t *)data;
 
-    if (SPECIAL_CONST_P((VALUE)key) || BUILTIN_TYPE((VALUE)key) == T_STRING) {
-        gc_mark(objspace, (VALUE)key);
-    }
-    else {
-        gc_mark_and_pin(objspace, (VALUE)key);
-    }
+    gc_mark(objspace, (VALUE)key);
     gc_mark(objspace, (VALUE)value);
     return ST_CONTINUE;
 }
-- 
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