From: "nobu (Nobuyoshi Nakada)" <noreply@...>
Date: 2021-12-22T06:45:30+00:00
Subject: [ruby-core:106767] [Ruby master Bug#18421] `IO#readpartial` and `IO#read_nonblock` return non-empty string on empty file

Issue #18421 has been reported by nobu (Nobuyoshi Nakada).

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Bug #18421: `IO#readpartial` and `IO#read_nonblock` return non-empty string on empty file
https://bugs.ruby-lang.org/issues/18421

* Author: nobu (Nobuyoshi Nakada)
* Status: Open
* Priority: Normal
* Backport: 2.6: REQUIRED, 2.7: REQUIRED, 3.0: REQUIRED
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With an empty file `empty_file`, this seems indisputably correct.
```ruby
File.open("empty_file") {|f| f.read(0, "abc")} #=> ""
```



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