[ruby-core:102998] [Ruby master Bug#17745] `IO#close_on_exec=` returns different value when called with `send, __send__, public_send` or not

Issue #17745 has been reported by kachick (Kenichi Kamiya).

----------------------------------------
Bug #17745: `IO#close_on_exec=` returns different value when called with `send, __send__, public_send` or not
https://bugs.ruby-lang.org/issues/17745

* Author: kachick (Kenichi Kamiya)
* Status: Open
* Priority: Normal
* ruby -v: ruby 3.0.0p0 (2020-12-25 revision 95aff21468) [x86_64-darwin20]
* Backport: 2.5: UNKNOWN, 2.6: UNKNOWN, 2.7: UNKNOWN, 3.0: UNKNOWN
----------------------------------------
```console
$ ruby -v -e 'p(STDIN.close_on_exec = 42)'
ruby 3.0.0p0 (2020-12-25 revision 95aff21468) [x86_64-darwin20]
42
```

```console
$ ruby -v -e 'p(STDIN.__send__ :close_on_exec=, 42)'
ruby 3.0.0p0 (2020-12-25 revision 95aff21468) [x86_64-darwin20]
nil
```

Is this an intentional behavior?
`ruby/spec` has the test case, But I can't think any benefit this different returning value 🤔  

PR: https://github.com/ruby/ruby/pull/4321



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