From: "mame (Yusuke Endoh) via ruby-core" <ruby-core@...>
Date: 2025-06-02T02:22:51+00:00
Subject: [ruby-core:122375] [Ruby Bug#21392] Data classes do not allow overriding #inspect

Issue #21392 has been updated by mame (Yusuke Endoh).

Status changed from Feedback to Assigned
Assignee set to ima1zumi (Mari Imaizumi)

Thank you, confirmed. @ima1zumi @tompng Can you take a look?

```
$ irb
irb(main):001* module Color
irb(main):002*   CIELAB = Data.define(:l, :a, :b) do
irb(main):003*     def inspect
irb(main):004*       "CIELAB [%.4f%% %.4f %.4f]" % [l, a, b]
irb(main):005*     end
irb(main):006*   end
irb(main):007> end
=> Color::CIELAB
irb(main):008> Color::CIELAB[1,2,3]
=> #<data Color::CIELAB l=1, a=2, b=3>
```

----------------------------------------
Bug #21392: Data classes do not allow overriding #inspect
https://bugs.ruby-lang.org/issues/21392#change-113519

* Author: austin (Austin Ziegler)
* Status: Assigned
* Assignee: ima1zumi (Mari Imaizumi)
* ruby -v: 3.4.4
* Backport: 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN
----------------------------------------
I'm preparing a new version of Color and I have decided to make all of the colour classes Data classes. However, it does not appear that `#inspect` can be overridden:


```ruby
module Color
  CIELAB = Data.define(:l, :a, :b) do
    def inspect
      "CIELAB [%.4f%% %.4f %.4f]" % [l, a, b]
    end
  end
end

p Color::CIELAB[1,2,3]
# Expected => CIELAB[1.000% 2.000 3.000]
# Actual #<data Color::CIELAB l=10, a=-125.0, b=20.5>
```

This feels like it should be permitted.



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