Issue #12684 has been reported by Carson Reinke.

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Bug #12684: Delegator#eql? missing
https://bugs.ruby-lang.org/issues/12684

* Author: Carson Reinke
* Status: Open
* Priority: Normal
* Assignee: 
* ruby -v: 2.3.1
* Backport: 2.1: UNKNOWN, 2.2: UNKNOWN, 2.3: UNKNOWN
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There is some strange behavior because Delegator is missing an alias of #eql? to #==

`2.3.1 :001 > s = 'test'
 => "test" 
2.3.1 :002 > d = SimpleDelegator.new(s)
 => "test" 
2.3.1 :003 > d.eql?(d)
 => false 
2.3.1 :004 > d == d
 => true 
2.3.1 :005 > d.hash == d.hash
 => true` 

I understand that `Delegator` is a `BasicObject` and that does not define #eql? method, but this method is being used by Array.

For example,

`2.3.1 :001 > s = 'test'
 => "test" 
2.3.1 :002 > a = [SimpleDelegator.new(s), SimpleDelegator.new(s)]
 => ["test", "test"] 
2.3.1 :003 > a[0] == a[1]
 => true 
2.3.1 :004 > a.uniq()
 => ["test", "test"]
2.3.1 :005 > a[0].hash == a[1].hash
 => true` 

Kind of strange behavior, especially reading the documentation.

Now maybe, `Array#uniq` should be changed to use #== instead of #eql?



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