From: "matz (Yukihiro Matsumoto) via ruby-core" <ruby-core@...>
Date: 2022-12-26T07:54:59+00:00
Subject: [ruby-core:111440] [Ruby master Bug#19259] `Data#with` doesn't call `initialize` nor `initialize_copy`

Issue #19259 has been updated by matz (Yukihiro Matsumoto).


In principle, it should call `initialize`. But we will reconsider if any there's any concern (e.g., performance).

Matz.


----------------------------------------
Bug #19259: `Data#with` doesn't call `initialize` nor `initialize_copy`
https://bugs.ruby-lang.org/issues/19259#change-100809

* Author: ko1 (Koichi Sasada)
* Status: Open
* Priority: Normal
* Backport: 2.7: UNKNOWN, 3.0: UNKNOWN, 3.1: UNKNOWN
----------------------------------------
`Data#with` doesn't call `initialize` nor `initialize_copy`.
It is confirmation request.

```ruby
class P < Data.define(:x, :y)
  def initialize_copy(...)
    p :initialize_copy
    super
  end

  def initialize(...)
    p :initialize
    super
  end
end

pt = P.new(1, 2)
#=> :initialize
pt.clone
#=> :initialize_copy
pt.dup
#=> :initialize_copy
pt.with(x: 10)
#=> N/A
```

For example, if an author of `P` add validation code, `#with` skips it.



-- 
https://bugs.ruby-lang.org/
 ______________________________________________
 ruby-core mailing list -- ruby-core@ml.ruby-lang.org
 To unsubscribe send an email to ruby-core-leave@ml.ruby-lang.org
 ruby-core info -- https://ml.ruby-lang.org/mailman3/postorius/lists/ruby-core.ml.ruby-lang.org/