Issue #13801 has been updated by kernigh (George Koehler).


Here's a counterexample with Array:

~~~ ruby
[1, 2, 3] === 2 #=> false
~~~

Array#=== doesn't look inside the array. I expect Set to act almost like Array, so it would be weird if Set#=== looked inside the container but Array#=== didn't.

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Feature #13801: Implement case equality test for Set#===
https://bugs.ruby-lang.org/issues/13801#change-66278

* Author: davidarnold (David Arnold)
* Status: Open
* Priority: Normal
* Assignee: knu (Akinori MUSHA)
* Target version: 
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In keeping with other class semantics, Set should implement an inclusion / membership test for #===.

For example with Range:

~~~ ruby
(1..3) === 2 #=> true
~~~

Desired behavior:

~~~ ruby
Set[1, 2, 3] === 2 #=> true
~~~

Current behavior:

~~~ ruby
Set[1, 2, 3] === 2 #=> false
~~~




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