From: "mame (Yusuke Endoh)" <noreply@...>
Date: 2022-05-19T23:56:31+00:00
Subject: [ruby-core:108628] [Ruby master Bug#18407] Behavior difference between integer and string flags to File creation

Issue #18407 has been updated by mame (Yusuke Endoh).


deivid (David Rodr��guez) wrote in #note-6:
> I still think at least the documentation should be updated to mention this

Suggestions for improvement are of course welcome.

Note that the current document says that `"b"` means "setting the encoding as binary and disabling line code conversion" and `File::BINARY` means just "disabling line code conversion".

https://docs.ruby-lang.org/en/master/IO.html#class-IO-label-Data+Mode
> 'b': Binary data; sets the default external encoding to Encoding::ASCII_8BIT; on Windows, suppresses conversion between EOL and CRLF.

https://docs.ruby-lang.org/en/master/File/Constants.html#BINARY
> BINARY
> disable line code conversion


----------------------------------------
Bug #18407: Behavior difference between integer and string flags to File creation
https://bugs.ruby-lang.org/issues/18407#change-97676

* Author: deivid (David Rodr��guez)
* Status: Closed
* Priority: Normal
* ruby -v: 3.0.3
* Backport: 2.6: UNKNOWN, 2.7: UNKNOWN, 3.0: UNKNOWN
----------------------------------------
Hi!

I was under the impression that these two commands should either both work of both fail, however they behave differently.

```shell-session
$ ruby -ropen-uri -EUTF-8:UTF-8 -e 'f = File.new("foo", "wb"); f.write URI.open("https://rubygems.org/gems/rake-13.0.6.gem").read'

$ ruby -ropen-uri -EUTF-8:UTF-8 -e 'f = File.new("foo", File::WRONLY | File::TRUNC | File::BINARY); f.write URI.open("https://rubygems.org/gems/rake-13.0.6.gem").read'
-e:1:in `write': "\\x8B" from ASCII-8BIT to UTF-8 (Encoding::UndefinedConversionError)
	from -e:1:in `<main>'
```

Could be an actual bug, and me misunderstanding the documentation. In any case it seemed worth reporting.



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