[ruby-core:97790] [Ruby master Feature#16688] Allow #to_path object as argument to system()

Issue #16688 has been updated by mame (Yusuke Endoh).


I'd like to confirm: `system(Pathname("cat /etc/passwd"))` should attempt to execute a file whose path is `./cat\ /etc/passwd`, not attempt to show the content of `/etc/passwd`, right?

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Feature #16688: Allow #to_path object as argument to system()
https://bugs.ruby-lang.org/issues/16688#change-85007

* Author: Dan0042 (Daniel DeLorme)
* Status: Open
* Priority: Normal
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I often work with Pathname objects, but when passing them to a system command I find it a bit tedious that they have to be explicitly converted to a String.

```ruby
file = BASE + "config.json"
system(@cmd, file)      #=> TypeError (no implicit conversion of Pathname into String)
system(@cmd, file.to_s) #=> works
```

I propose that the system/exec/spawn family of methods should try to convert their arguments using `to_path`, if `to_str` fails. I believe it makes perfect sense, since commandline arguments are so often pathnames.

This includes in/out redirection. `system("ls", out: Pathname.new("file"))` should be valid.



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