Issue #20255 has been updated by byroot (Jean Boussier).
The best solution is to not allow these callbacks,
So it's not actually possible, because many types rely on it. e.g: ```ruby class Array def initialize_clone(o) # noop end end p [1, 2, 3, 4, 5].clone # => [] ``` ---------------------------------------- Bug #20255: Embedded arrays aren't moved correctly across ractors https://bugs.ruby-lang.org/issues/20255#change-112539 * 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]" ``` -- https://bugs.ruby-lang.org/