Issue #9857 has been reported by Kazuhiro NISHIYAMA.

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Feature #9857: Pathname#birthtime
https://bugs.ruby-lang.org/issues/9857

* Author: Kazuhiro NISHIYAMA
* Status: Open
* Priority: Normal
* Assignee: 
* Category: ext
* Target version: current: 2.2.0
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`File.birthtime` が追加されたので `Pathname#birthtime` もあると良いのではないでしょうか。



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