[ruby-core:119956] [Ruby master Bug#20871] Including methods in Enumerable doesn't make them available in Array

Issue #20871 has been updated by rolf (Rolf T).


I managed to narrow it down a bit further. With the versions specified in https://github.com/rolftimmermans/ruby-20871/blob/main/Gemfile.lock:

```ruby
% irb
irb(main):001> require "active_support"
irb(main):002> require "active_support/json/decoding"
irb(main):003> require "active_support/core_ext/object/try"
irb(main):004> 
irb(main):005* class Foo
irb(main):006*   include Enumerable
irb(main):007> end
irb(main):008> 
irb(main):009* module Ext
irb(main):010*   def foo
irb(main):011*     "foo"
irb(main):012*   end
irb(main):013> end
irb(main):014> 
irb(main):015> Enumerable.include(Ext)
irb(main):016> 
=> Enumerable
irb(main):017> [].foo
(irb):17:in `<main>': undefined method `foo' for an instance of Array (NoMethodError)

[].foo
  ^^^^
	from <internal:kernel>:187:in `loop'
	from /Users/rolftimmermans/.gem/ruby/3.3.6/gems/irb-1.14.1/exe/irb:9:in `<top (required)>'
	from /Users/rolftimmermans/.gem/ruby/3.3.6/bin/irb:25:in `load'
	from /Users/rolftimmermans/.gem/ruby/3.3.6/bin/irb:25:in `<main>'
```


----------------------------------------
Bug #20871: Including methods in Enumerable doesn't make them available in Array
https://bugs.ruby-lang.org/issues/20871#change-110687

* Author: sanderd17 (Sander Deryckere)
* Status: Feedback
* ruby -v: 3.3.6
* Backport: 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN
----------------------------------------
Today, our CI pipeline started failing after the automatic update from v3.3.5 to v3.3.6.

After researching, it turned out that our core extensions to the `Array` class weren't loaded anymore.

The core-extensions code looks like this:

```ruby

module CoreExt
  module Enumerable
    def average
      sum(&:to_f) / count if any?
    end

    # def ...
  end
end

Enumerable.include CoreExt::Enumerable
```

After some debugging, it turned out that the `average` method was included in the `instance_methods` of `Enumerable`, but not in the `instance_methods` of `Array`.

Explicitly adding `Array.include CoreExt::Enumerable` fixes CI for our case.


The very strange thing is that it only happens on a release branch we are still maintaining. It doesn't happen on our main development branch (which also updated to v3.3.6 today). I have been unable to find the difference between both branches so far (they diverged a couple of months ago, but the base system is still regularly updated on both, and pretty similar).

After some digging around, I assume this commit is related to our issue: https://github.com/ruby/ruby/commit/edeb0319f7a95dfe3f9b895bcf32371dd8514726



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