[ruby-core:109865] [Ruby master Bug#18998] Kernel#Integer does not convert SimpleDelegator object expectly

["byroot (Jean Boussier)" <noreply@ruby-lang.org>]

Issue #18998 has been updated by byroot (Jean Boussier).


> My thought is that Integer method should convert a Delegator object like when a String is given.

I don't think it would be advisable for `Kernel#Integer` to know about `Delegator`. `Delegator` is just a class from the stdlib, you could implement the same yourself and that wouldn't solve your problem.

I think based on the spec lined up above, it would be best if you defined `#to_int` on your delegator. But I don't know your full use case, so not sure if it's relevant.

Either way I don't think there is really a bug here, aside from maybe the method needed more documentation.

A change of behavior would fall under a feature request, and a proper spec would need to be drafted. The only possible change I could see would be to try to call `to_str` between `to_int` and `to_i`, but that could be a breaking change, so a hard sell.

----------------------------------------
Bug #18998: Kernel#Integer does not convert SimpleDelegator object expectly
https://bugs.ruby-lang.org/issues/18998#change-99105

* 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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