Remove Faraday::Utils::Headers#initialize_copy

[yykamei]

Faraday::Utils::Headers inherits Hash and override #initialize_copy.

Previously, #initialize_copy was called in the test file for Faraday to check the type signature, but I noticed the use of this method is marked as an error by Steep. I'm not sure why the current version of Steep reports it, but I decided to remove the declaration from the type signature because #initialize_copy is in the first place a private method originally. In my opinion, it doesn't make sense to expose the signature of #initialize_copy since it cannot be used without #send.

Here is an example code to confirm the method is private.

$ ruby --version
ruby 3.4.0preview1 (2024-05-16 master 9d69619623) [arm64-darwin23]
$
$ ruby <<RUBY

class A < Hash
  def initialize_copy(*)
    super
  end
end

A.new.initialize_copy(A.new)
RUBY
-:8:in '<main>': private method 'initialize_copy' called for an instance of A (NoMethodError)

UPDATE:

As @ksss commented, #initialize_copy is always treated as private from this change. The RBS change is associated with the error report.

[github-actions[bot]]

@yykamei Thanks for your contribution!

Please follow the instructions below for each change. See also: https://github.com/ruby/gem_rbs_collection/blob/main/docs/CONTRIBUTING.md

Available commands

You can use the following commands by commenting on this PR.

• /merge: Merge this PR if CI passes

---

faraday

You changed RBS files for an existing gem. You can merge this PR yourself because you are a reviewer of this gem. Just comment /merge to merge this PR.

You can also request a review from other reviewers if you want.

[ksss]

Perhaps this change has something to do with it. https://github.com/ruby/rbs/pull/1774 Since rbs 3.5, initialize_copy is automatically treated as private. (This mimics Ruby's behavior.)

[yykamei]

Wow, thank you for sharing such great information. It makes sense to always make the methods , such as #initialize_copy, private. From my perspective, there would be no problems proceeding with the pull request changes because Ruby, as well as RBS, treats #initialize_copy as private. Am I correct?

Anyway, I appreciate your changes on RBS 👍

[ksss]

Yes, LGTM.

[yykamei]

/merge