[ruby-core:82867] [Ruby trunk Feature#13801] Implement case equality test for Set#===

Issue #13801 has been updated by knu (Akinori MUSHA).


I don't remember but I guess I didn't define `Set#===` probably because Array didn't, but I agree `Set#===` could be useful and intuitive, so I've merged your PR with a slight modification (alias to save an extra method call) and a test in addition to the specs.  Thanks!

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Feature #13801: Implement case equality test for Set#===
https://bugs.ruby-lang.org/issues/13801#change-66766

* Author: davidarnold (David Arnold)
* Status: Closed
* 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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