[ruby-core:113635] [Ruby master Misc#19691] File.realpath on Windows does not return actual case of the file

Issue #19691 has been updated by jeremyevans0 (Jeremy Evans).

Subject changed from Case insensitive file systems, require filename casing to File.realpath on Windows does not return actual case of the file
Status changed from Feedback to Open

Looks like #17885 fixed the issue for case-insensitive Mac OS file systems.  However, it is not fixed on Windows because `File.realpath` on Windows doesn't fix the case:

```ruby
File.realpath('a')
# => "C:/Users/jeremye/a"
File.realpath('A')
# => "C:/Users/jeremye/A"
```

Not sure if that is considered a bug in `File.realpath`, but it would be nice if `File.realpath` returned the actual case of the file.

----------------------------------------
Misc #19691: File.realpath on Windows does not return actual case of the file
https://bugs.ruby-lang.org/issues/19691#change-103279

* Author: MSP-Greg (Greg L)
* Status: Open
* 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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