[ruby-core:109862] [Ruby master Bug#18998] Kernel#Integer does not convert SimpleDelegator object expectly

["taichi730 (Taichi Ishitani)" <noreply@ruby-lang.org>]

Issue #18998 has been updated by taichi730 (Taichi Ishitani).


Thank you for your reply.
I understood that there is no documented specification and the current implementation.

How should Integer method behave for this case?
My thought is that Integer method should convert a Delegator object like when a String is given.
Because of this, I override Integer method like below in my project.

```ruby
module Kernel
  alias_method :__orignal_Integer, :Integer

  def Integer(arg, base = 0, exception: true)
    arg = arg.__getobj__ if arg.is_a?(::Delegator)
    __orignal_Integer(arg, base, exception: exception)
  end
end
```

----------------------------------------
Bug #18998: Kernel#Integer does not convert SimpleDelegator object expectly
https://bugs.ruby-lang.org/issues/18998#change-99102

* Author: taichi730 (Taichi Ishitani)
* Status: Open
* Priority: Normal
* ruby -v: ruby 3.1.2p20 (2022-04-12 revision 4491bb740a) [x86_64-linux]
* Backport: 2.7: UNKNOWN, 3.0: UNKNOWN, 3.1: UNKNOWN
----------------------------------------
Kernel#Integer method doens not convert a SimpleDelegator object of which value is a String.
This is an sample code.

``` ruby
require 'delegate'
p Integer(SimpleDelegator.new('0x10'))
```

I expect Kernel#Integer to convert the input value as a String and the expected returned value is `16`.
Hoever the actual returned value is `0` so it's seemed that `#to_i` method is just called.

```
taichi@LAPTOP-TVTKLNFD:temp
$ cat test.rb
require 'delegate'
p Integer(SimpleDelegator.new('0x10'))

taichi@LAPTOP-TVTKLNFD:temp
$ ruby test.rb
0
```

Which is the correct behavior?




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