[ruby-core:89062] [Ruby trunk Bug#15135] Refining #initialize method not working

Issue #15135 has been reported by cbruckmayer (Christian Bruckmayer).

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Bug #15135: Refining #initialize method not working
https://bugs.ruby-lang.org/issues/15135

* Author: cbruckmayer (Christian Bruckmayer)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: ruby 2.5.0p0 (2017-12-25 revision 61468)
* Backport: 2.3: UNKNOWN, 2.4: UNKNOWN, 2.5: UNKNOWN
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See the following example:

```
class C
  def initialize(arg)
    puts arg
  end
end

module M
  refine C do
    def initialize(arg1, arg2)
      puts arg1, arg2
    end
  end
end

using M
C.new("foo") # works
C.new("foo", "bar") # wrong number of arguments (given 2, expected 1) (ArgumentError)
```

This code will throw an ``refinement.rb:2:in `initialize': wrong number of arguments (given 2, expected 1) (ArgumentError)`` exception. I would expect that it is possible to refine the initialize method to have similar behavior as monkey patching. If this is intended behavior I would at least expect this to be documented here: https://docs.ruby-lang.org/en/2.5.0/syntax/refinements_rdoc.html



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