[ruby-core:115976] [Ruby master Bug#20078] StringIO cannot be moved between Ractors

Issue #20078 has been updated by luke-gru (Luke Gruber).


I created a PR that updates the Ractor docs: https://github.com/ruby/ruby/pull/9395. It doesn't go into much detail about the situation but clarifies it a bit.

Adding a `movable?` method would have have to be a separate ticket @forthoney. I think it's an okay idea, but I'm a bit concerned because then should we add a `copyable?` method too? We could just have a `sendable?` method that takes the `move` keyword, which could deal with both copying and moving cases. I think unit or integration tests would catch most cases of sending the wrong objects across Ractors, but I see a use for it.

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Bug #20078: StringIO cannot be moved between Ractors
https://bugs.ruby-lang.org/issues/20078#change-105940

* Author: forthoney (Seong-Heon Jung)
* Status: Open
* Priority: Normal
* ruby -v: 3.2
* Backport: 3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: UNKNOWN
----------------------------------------
The following code will raise an unusual Ractor error.
``` ruby
require 'stringio'
r = Ractor.new { loop { Ractor.receive } }
Ractor.shareable?(StringIO.new) #=> false
r.send(StringIO.new) # passing it via copy works
r.send(StringIO.new, move: true) # <internal:ractor>:587:in `send': can not move StringIO object. (Ractor::Error)
```
I'm not 100% sure but I believe that this probably not the intended behavior considering
* The error raised is a generic `Ractor::Error` rather than something specific like Ractor::MovedError or Ractor::IsolationError
* It can be copied
* [No documentation](https://docs.ruby-lang.org/en/master/ractor_md.html) exists for this error
* I have yet to seen this happen on any other class instance
* Typo (can not -> cannot)



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