Issue #14266 has been reported by znz (Kazuhiro NISHIYAMA).

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Bug #14266: Set#clone(freeze: false) makes frozen internal hash
https://bugs.ruby-lang.org/issues/14266

* Author: znz (Kazuhiro NISHIYAMA)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: ruby 2.6.0dev (2018-01-01 trunk 61537) [x86_64-darwin16]
* Backport: 2.3: UNKNOWN, 2.4: UNKNOWN, 2.5: UNKNOWN
----------------------------------------
```
% irb -r irb/completion --simple-prompt
>> require 'set'
=> true
>> set=Set[].freeze.clone(freeze: false)
=> #<Set: {}>
>> set.frozen?
=> false
>> set.instance_variable_get(:@hash).frozen?
=> true
```

In `Set#initialize_clone`, clone hash without freeze keyword argument.
But I think there is no easy way how to know freeze keyword argument value in `initialize_clone`.

```
  # Clone internal hash.
  def initialize_clone(orig)
    super
    @hash = orig.instance_variable_get(:@hash).clone
  end
```



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