[ruby-core:106932] [Ruby master Bug#18421] `IO#readpartial` and `IO#read_nonblock` return non-empty string on empty file

Issue #18421 has been updated by usa (Usaku NAKAMURA).

Backport changed from 2.6: REQUIRED, 2.7: REQUIRED, 3.0: REQUIRED to 2.6: REQUIRED, 2.7: DONE, 3.0: REQUIRED

ruby_2_7 c4a5eaf37b9bf87f8324a7070c8dbc597b89c4fc merged revision(s) fdf39963490cf2cf95b30d91bb9b35964c2c2350.

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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#change-95753

* Author: nobu (Nobuyoshi Nakada)
* Status: Closed
* Priority: Normal
* Backport: 2.6: REQUIRED, 2.7: DONE, 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")} #=> ""
```

OTOH, obviously these seem bugs.
```ruby
File.open("empty_file") {|f|f.readpartial(0, "abc")} #=> "abc"

File.open("empty_file") {|f|f.read_nonblock(0, "abc")} #=> "abc"
```

https://github.com/ruby/ruby/pull/5323



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