[ruby-core:78409] [Ruby trunk Bug#12989] Passing `binmode: true` to `IO.pipe` makes `binmode?` return `true` but encoding is not binary

Issue #12989 has been updated by Nobuyoshi Nakada.

Description updated

Encoding argument should be prior to `binmode` option.

```ruby
$ ruby -e 'open(IO::NULL, "r", binmode: true){|f| p [f.binmode?, f.external_encoding]}'
[true, #<Encoding:ASCII-8BIT>]
$ ruby -e 'open(IO::NULL, "r:utf-8", binmode: true){|f| p [f.binmode?, f.external_encoding]}'
[true, #<Encoding:UTF-8>]
```

Your patch always makes `external_encoding` `ASCII-8BIT` when `binmode` is set, even if an encoding is given.

----------------------------------------
Bug #12989: Passing `binmode: true` to `IO.pipe` makes `binmode?` return `true` but encoding is not binary
https://bugs.ruby-lang.org/issues/12989#change-61782

* Author: Aaron Patterson
* Status: Open
* Priority: Normal
* Assignee: 
* ruby -v: ruby 2.4.0dev (2016-11-16 gc-compact 56805) [x86_64-darwin16]
* Backport: 2.1: UNKNOWN, 2.2: UNKNOWN, 2.3: UNKNOWN
----------------------------------------
Here is a sample program:

~~~ruby
Encoding.default_external = Encoding::UTF_8
Encoding.default_internal = Encoding::UTF_8

reader, writer = IO.pipe(binmode: true)
reader.binmode?           # => true
reader.external_encoding  # => #<Encoding:UTF-8>
writer.binmode?           # => true
writer.external_encoding  # => #<Encoding:UTF-8>

reader, writer = IO.pipe
reader.binmode
writer.binmode

reader.binmode?           # => true
reader.external_encoding  # => #<Encoding:ASCII-8BIT>
writer.binmode?           # => true
writer.external_encoding  # => #<Encoding:ASCII-8BIT>
~~~

I think that passing `binmode: true` to `IO.pipe` should behave the same way as calling `binmode` on each file.  Today, passing `binmode: true` to IO.pipe puts the files in a strange state: they are binary and not binary.

I've attached a patch to fix the problem.

---Files--------------------------------
0001-Passing-binmode-true-to-IO.pipe-should-behave-like-b.patch (2.5 KB)


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