From: "ko1 (Koichi Sasada) via ruby-core" <ruby-core@...>
Date: 2022-12-26T01:44:16+00:00
Subject: [ruby-core:111431] [Ruby master Bug#19259] `Data#with` doesn't call `initialize` nor `initialize_copy`

Issue #19259 has been reported by ko1 (Koichi Sasada).

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

* 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

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

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



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