[ruby-core:108624] [Ruby master Bug#18407] Behavior difference between integer and string flags to File creation

Issue #18407 has been updated by deivid (David Rodr鱈guez).


Thanks @mame!

I still think at least the documentation should be updated to mention this, because the current wording makes me think the alternatives I tried should be equivalent and both work: https://ruby-doc.org/core-3.1.2/IO.html#method-c-new.

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Bug #18407: Behavior difference between integer and string flags to File creation
https://bugs.ruby-lang.org/issues/18407#change-97673

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