From: "byroot (Jean Boussier) via ruby-core" <ruby-core@...>
Date: 2025-03-31T15:10:11+00:00
Subject: [ruby-core:121488] [Ruby Bug#20255] Embedded arrays aren't moved correctly across ractors

Issue #20255 has been updated by byroot (Jean Boussier).


https://github.com/ruby/ruby/pull/13023

----------------------------------------
Bug #20255: Embedded arrays aren't moved correctly across ractors
https://bugs.ruby-lang.org/issues/20255#change-112510

* Author: luke-gru (Luke Gruber)
* Status: Closed
* Assignee: ko1 (Koichi Sasada)
* Backport: 3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN
----------------------------------------
`ractor.send(ary, move: true)` works incorrectly because if `ary` is embedded, the new moved object doesn't populate its own embedded space, it uses the MovedObject's embedded space.

example:
```ruby
r = Ractor.new {
  inner_ary = receive
  values = {}
  values[:equal] = (inner_ary == ["",{},2,3,4,5,6])
  values[:string] = inner_ary.to_s
  values
}
ary = [String.new,Hash.new,2,3,4,5,6]
r.send(ary, move: true)
r_values = r.take
p r_values[:equal]
p r_values[:string]

# => false
# => "[\"\", {}, 2, 2.0, 21747991570, String, 3]"

```




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