[ruby-core:91726] [Ruby trunk Bug#15646] method_defined? inside method_added behaves differently for `initialize`

Issue #15646 has been updated by nobu (Nobuyoshi Nakada).


I think it is documented somewhere, but can't remember where it is now.

Anyway, these methods are always defined as private, unless singleton methods.
`initialize`, `initialize_copy`, `initialize_clone`, `initialize_dup`, `respond_to_missing?`


----------------------------------------
Bug #15646: method_defined? inside method_added behaves differently for `initialize`
https://bugs.ruby-lang.org/issues/15646#change-77001

* Author: alanwu (Alan Wu)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: ruby 2.7.0dev (2019-03-08 trunk 67194) [x86_64-darwin18]
* Backport: 2.4: UNKNOWN, 2.5: UNKNOWN, 2.6: UNKNOWN
----------------------------------------
Repro:
```ruby
class MethodAddedSpecialCase
  def self.method_added(name)
    puts "#{name} added, method_defined?: #{method_defined?(name)}"
  end

  def hello
  end

  def initialize
  end
  
  def world
  end
end
```

Output:
```
hello added, method_defined?: true
initialize added, method_defined?: false
world added, method_defined?: true
```



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