[ruby-core:113634] [Ruby master Misc#19691] Case insensitive file systems, require filename casing

Issue #19691 has been updated by nobu (Nobuyoshi Nakada).

Tracker changed from Bug to Misc
Status changed from Open to Feedback
Backport deleted (3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: UNKNOWN)

I think it has changed since 3.1.

```shell-session
$ ruby3.0 -v -W0 -rsingleton -rSingleton -e 'p $"[-2..-1]'
ruby 3.0.6p216 (2023-03-30 revision 23a532679b) [x86_64-darwin22]
/opt/local/lib/ruby/3.0.0/Singleton.rb:152:in `undef_method': undefined method `extend_object' for class `Singleton' (NameError)
Did you mean?  extended
	from /opt/local/lib/ruby/3.0.0/Singleton.rb:152:in `singleton class'
	from /opt/local/lib/ruby/3.0.0/Singleton.rb:140:in `<module:Singleton>'
	from /opt/local/lib/ruby/3.0.0/Singleton.rb:94:in `<top (required)>'
	from <internal:/opt/local/lib/ruby/3.0.0/rubygems/core_ext/kernel_require.rb>:85:in `require'
	from <internal:/opt/local/lib/ruby/3.0.0/rubygems/core_ext/kernel_require.rb>:85:in `require'
bash: exit 1

$ ruby3.1 -v -rsingleton -rSingleton -e 'p $"[-2..-1]'
ruby 3.1.3p185 (2022-11-24 revision 1a6b16756e) [x86_64-darwin22]
["/opt/local/lib/ruby/3.1.0/did_you_mean.rb", "/opt/local/lib/ruby/3.1.0/singleton.rb"]
```


----------------------------------------
Misc #19691: Case insensitive file systems, require filename casing
https://bugs.ruby-lang.org/issues/19691#change-103274

* Author: MSP-Greg (Greg L)
* Status: Feedback
* Priority: Normal
----------------------------------------
I don't know what I think of this (expected or bug), but recently in a forum I saw an issue that I don't recall accidentally doing myself.  An equivalent example:
```
ruby -rsingleton -rSingleton -e "puts 'case issue'"
```

Note the change of casing with `Singleton`.

On case insensitive file systems, the above will double load the file, which errors.

Obviously, on case sensitive file systems, it errors with `cannot load such file -- Singleton`

So, options are:

A. No change to current behavior, which I'm fine with.

B. If the OS is case insensitive, don't reload the file, and maybe a warning that `Singleton` and `singleton` are equivalent. 




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