[ruby-core:81970] [Ruby trunk Feature#13733] Dump the delegator instead of the delegated object

Issue #13733 has been reported by huynhquancam (Cam Huynh).

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Feature #13733: Dump the delegator instead of the delegated object
https://bugs.ruby-lang.org/issues/13733

* Author: huynhquancam (Cam Huynh)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
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I would like to let Delegator dump itself instead of the delegated object.

Let's consider the following scenario.

~~~
require "delegate"

class Foo < Delegator
  def initialize(the_obj)
    @the_obj = the_obj
  end

  def __getobj__
    @the_obj
  end
end

foo = Foo.new(nil)
foo.inspect
# nil
~~~

This dump message might cause confusion because foo object itself is not nil. Why don't we be clear and have a dump message like "foo is an Foo class with nil as the delegated object"?

I have submitted an PR on https://github.com/ruby/ruby/pull/1653 for your reference.



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