[ruby-core:112325] [Ruby master Feature#19351] Promote bundled gems at Ruby 3.3

Issue #19351 has been updated by hsbt (Hiroshi SHIBATA).

Description updated

We discussed about this at #19357 

@mame suggested It's hard to research affected gems that are promoted bundled gems from default gems. Ex. `resolve-replace`, `nkf` are used by prod application in the real world. I'll work to introduce PoC for bypassing `clean_env` of bundler before triaging default gems.



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Feature #19351: Promote bundled gems at Ruby 3.3
https://bugs.ruby-lang.org/issues/19351#change-101770

* Author: hsbt (Hiroshi SHIBATA)
* Status: Assigned
* Priority: Normal
* Assignee: hsbt (Hiroshi SHIBATA)
----------------------------------------
In Ruby 3.2, the default gems and bundled gems are changed only adding `syntax_suggest`. I and some committers are considering promote default gems to bundled gems again for Ruby 3.3+.

We hope to keep the current developer experience with dependency resolution and ignore the additional work like "Put gem "xxx" into your Gemfile" for developers.

### Proposal

We propose the following libraries will promote default gems to bundled gems at Ruby 3.3. They are not the dependencies of Rails and RubyGems/Bundler.


```
abbrev
getoptlong
observable
resolv
resolv-replace
rinda
fcntl (C-ext)
nkf (C-ext)
syslog (C-ext)
win32ole (C-ext)
```

Update: I removed `optparse` and `un` from above list. Because they are used by Ruby build process.

```
optparse
un
```


### Additional works

I also propose to promote rails dependencies without rubygems/bundler deps:

```
base64
benchmark
delegate
drb
forwardable
ipaddr
irb
mutex_m
ostruct
rdoc
singleton
tsort
weakref
bigdecimal (C-ext)
date(datetime) (C-ext)
racc (C-ext)
```

and gems maintained by @kou 

```
csv
```

Following gems also maintained by @kou, but they are used on RubyGems/Bundler or MJIT. Maybe, We couldn't promote them because RubyGems/Bundler couldn't bundle C-ext gems.

```
fiddle (C-ext): used by MJIT
stringio (C-ext) used by RubyGems/Bundler
strscan (C-ext) used by RubyGems/Bundler
```

But if we promote them to bundled gems, many of users need to add like `gem "csv"` into their Gemfile. I'm considering to avoid this situation.

Can we introduce the specific feature of bundled gems to RubyGems or Bundler? Example, bundler have allowed list for bundled gems. So, listed gems could be require without Gemfile under the bundle exec.



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