Note that Set has become a core class since Ruby 4.0

hsbt · claude · hsbt · commit 0801252fbc76 · 2026-04-15T16:35:01.000+09:00
Development of this gem repository has ended and feature requests and bug reports should be directed to bugs.ruby-lang.org. See https://bugs.ruby-lang.org/issues/21216 for details. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
diff --git a/README.md b/README.md
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+**Note:** As of Ruby 4.0, `Set` has become a core class (see [Feature #21216](https://bugs.ruby-lang.org/issues/21216)). Development of this gem repository has ended. Please report feature requests and bug reports at [bugs.ruby-lang.org](https://bugs.ruby-lang.org/).
+
 # Set
 
 This library provides the Set class, which deals with a collection of

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	`1`	+Note: As of Ruby 4.0, `Set` has become a core class (see [Feature #21216](https://bugs.ruby-lang.org/issues/21216)). Development of this gem repository has ended. Please report feature requests and bug reports at [bugs.ruby-lang.org](https://bugs.ruby-lang.org/).
	`2`	`+`
`1`	`3`	`# Set`
`2`	`4`
`3`	`5`	`This library provides the Set class, which deals with a collection of`