[ruby-core:113637] [Ruby master Misc#19691] File.realpath on Windows does not return actual case of the file

Issue #19691 has been updated by MSP-Greg (Greg L).


@jeremyevans0

Thanks. I hadn't looked yet.  JFYI, `File.absolute_path` does seem to work correctly.

```
# file name is Greg.txt
puts File.absolute_path 'C:/tmpdir/greg.txt' #=> C:/tmpdir/Greg.txt

# file name is ggreg.txt
puts File.absolute_path 'C:/tmpdir/GGreg.txt' #=> C:/tmpdir/ggreg.txt
```


```

----------------------------------------
Misc #19691: File.realpath on Windows does not return actual case of the file
https://bugs.ruby-lang.org/issues/19691#change-103281

* 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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