From: "nobu (Nobuyoshi Nakada)" <noreply@...>
Date: 2021-09-16T05:13:34+00:00
Subject: [ruby-core:105282] [Ruby master Bug#18171] `Marshal` ignores	`Hash#compare_by_identity`

Issue #18171 has been reported by nobu (Nobuyoshi Nakada).

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Bug #18171: `Marshal` ignores `Hash#compare_by_identity`
https://bugs.ruby-lang.org/issues/18171

* Author: nobu (Nobuyoshi Nakada)
* Status: Open
* Priority: Normal
* Assignee: matz (Yukihiro Matsumoto)
* Backport: 2.6: UNKNOWN, 2.7: UNKNOWN, 3.0: UNKNOWN
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Is this a bug?

```ruby
h = {}.compare_by_identity
h["a"+"1"] = "1"
h["a"+"1"] = "2"
p h                             #=> {"a1"=>"1", "a1"=>"2"}
p Marshal.load(Marshal.dump(h)) #=> {"a1"=>"2"}
```



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