[ruby-core:121964] [Ruby Bug#21316] Namespaces leak with permanent names

Issue #21316 has been updated by fxn (Xavier Noria).


Main problem here is that there are many programs that depend on that name. They may store it somewhere for later `const_get` (for example polymorphic Active Record associations), passed to a callback (for example `on_load` callbacks in Zeitwerk), etc.

That the name matches the constant path of the class or module being defined is a strong property of the language people rely on.

----------------------------------------
Bug #21316: Namespaces leak with permanent names
https://bugs.ruby-lang.org/issues/21316#change-113080

* 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
C = Class.new
C.name == 'C'
```

because under a non-main user namespace, the name of `C` has the namespace as a prefix.



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