[ruby-core:121951] [Ruby Bug#21317] Namespaces leak with object IDs

Issue #21317 has been reported by fxn (Xavier Noria).

----------------------------------------
Bug #21317: Namespaces leak with object IDs
https://bugs.ruby-lang.org/issues/21317

* Author: fxn (Xavier Noria)
* Status: Open
* Backport: 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN
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Namespaces are not transparent for this program

```ruby
if mod1.object_id == mod2.object_id
  mod1.constants == mod2.constants
end
```

because it may fail for `mod1 = Object; mod2 = ns::Object`, which have the same object ID.



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