[ruby-core:122047] [Ruby Bug#21324] Namespace loads RubyGems in root Namespace but it should not

Issue #21324 has been updated by Eregon (Benoit Daloze).


Loading RubyGems creates more constants than just `Gem`:
```
$ ruby -v --disable-gems -e 'a=Object.constants; require "rubygems"; b=Object.constants; p b-a'
ruby 3.4.1 (2024-12-25 revision 48d4efcb85) +PRISM [x86_64-linux]
[:Monitor, :MonitorMixin, :Gem, :CROSS_COMPILING, :RbConfig, :RUBYGEMS_ACTIVATION_MONITOR]
```

It seems very messy to try to remove that from the root namespace.

The clean solution seems obvious: `gem_prelude.rb` shouldn't be loaded in the root namespace, but only in user namespaces.

----------------------------------------
Bug #21324: Namespace loads RubyGems in root Namespace but it should not
https://bugs.ruby-lang.org/issues/21324#change-113197

* Author: Eregon (Benoit Daloze)
* Status: Open
* ruby -v: ruby 3.5.0dev (2025-05-10T07:50:29Z namespace-on-read-.. bd4f57f96b) +PRISM [x86_64-linux]
* Backport: 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN
----------------------------------------
RubyGems has tons of mutable state, isn't core library and isn't "builtin classes" either, so it should not be in root Namespace, but it is currently:
```
$ RUBY_NAMESPACE=1 ruby -ve 'ns = Namespace.new; p ns::Gem.equal?(Gem)'
ruby 3.5.0dev (2025-05-10T07:50:29Z namespace-on-read-.. bd4f57f96b) +PRISM [x86_64-linux]
ruby: warning: Namespace is experimental, and the behavior may change in the future!
See doc/namespace.md for know issues, etc.
true
```

A concrete example of what breaks most likely due to this:
```
$ gem i delegate:0.3.1
$ RUBY_NAMESPACE=1 ruby -ve 'require "delegate"; p Delegator::VERSION; ns = Namespace.new; File.write "ns.rb", "gem %{delegate}, %{0.3.1}; require :delegate.to_s; p Delegator::VERSION"; ns.require "./ns"'
ruby 3.5.0dev (2025-05-10T07:50:29Z namespace-on-read-.. bd4f57f96b) +PRISM [x86_64-linux]
ruby: warning: Namespace is experimental, and the behavior may change in the future!
See doc/namespace.md for know issues, etc.
"0.4.0"
/home/eregon/prefix/ruby-master/lib/ruby/3.5.0+0/rubygems/specification.rb:2232:in 'Gem::Specification#check_version_conflict': can't activate delegate-0.3.1, already activated delegate-0.4.0 (Gem::LoadError)
	from /home/eregon/prefix/ruby-master/lib/ruby/3.5.0+0/rubygems/specification.rb:1383:in 'Gem::Specification#activate'
	from /home/eregon/prefix/ruby-master/lib/ruby/3.5.0+0/rubygems/core_ext/kernel_gem.rb:62:in 'block in Kernel#gem'
	from /home/eregon/prefix/ruby-master/lib/ruby/3.5.0+0/rubygems/core_ext/kernel_gem.rb:62:in 'Thread::Mutex#synchronize'
	from /home/eregon/prefix/ruby-master/lib/ruby/3.5.0+0/rubygems/core_ext/kernel_gem.rb:62:in 'Kernel#gem'
	from /home/eregon/ns.rb:1:in '<top (required)>'
	from -e:1:in 'Namespace#require'
	from -e:1:in '<main>'
```
i.e. `ns` sees delegate-0.4.0 was loaded in main namespace but it shouldn't.

Previously mentioned in https://bugs.ruby-lang.org/issues/21311#note-36



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