Issue #13067 has been updated by Nobuyoshi Nakada.


Aaron Patterson wrote:
> The `:itself.to_proc` doesn't look so great as an alternative, but maybe we could make `case / when` support `&:itself` syntax.

`case / when` isn't the original concern, but just an unexpected side effect.
Everybody can write that `foo` method, and `select(&method(:foo))` and so on, but it won't look nice.

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Feature #13067: TrueClass,FalseClass to provide `===` to match truthy/falsy values.
https://bugs.ruby-lang.org/issues/13067#change-62386

* Author: Yukihiro Matsumoto
* Status: Open
* Priority: Normal
* Assignee: Yukihiro Matsumoto
* Target version: 
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I propose to make `TrueClass`, `FalseClass` to provide `===` method to match truthy values (`TrueClass`), and falsy values (`FalseClass`), so that we can use true and false for case pattern matching.  And we can pick truthy values using `grep` e.g. `ary.grep(true)`.

Matz.



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