[ruby-core:109651] [Ruby master Bug#18899] Inconsistent argument handling in IO#set_encoding
From:
"jeremyevans0 (Jeremy Evans)" <noreply@...>
Date:
2022-08-23 22:20:56 UTC
List:
ruby-core #109651
Issue #18899 has been updated by jeremyevans0 (Jeremy Evans).
I think it is a bug. I submitted a pull request to fix it: https://github.com/ruby/ruby/pull/6280. Not sure if the approach taken is the best way, though.
----------------------------------------
Bug #18899: Inconsistent argument handling in IO#set_encoding
https://bugs.ruby-lang.org/issues/18899#change-98874
* Author: javanthropus (Jeremy Bopp)
* Status: Open
* Priority: Normal
* ruby -v: ruby 3.1.2p20 (2022-04-12 revision 4491bb740a) [x86_64-linux]
* Backport: 2.7: UNKNOWN, 3.0: UNKNOWN, 3.1: UNKNOWN
----------------------------------------
`IO#set_encoding` behaves differently when processing a single String argument than it does when processing 2 arguments (whether Strings or Encodings) in the case where the external encoding is being set to binary and the internal encoding is being set to any other encoding.
This script demonstrates the resulting values of the external and internal encodings for an IO instance given different ways to equivalently call `#set_encoding`:
```ruby
#!/usr/bin/env ruby
def show(io, args)
printf(
"args: %-50s external encoding: %-25s internal encoding: %-25s\n",
args.inspect,
io.external_encoding.inspect,
io.internal_encoding.inspect
)
end
File.open('/dev/null') do |f|
args = ['binary:utf-8']
f.set_encoding(*args)
show(f, args)
args = ['binary', 'utf-8']
f.set_encoding(*args)
show(f, args)
args = [Encoding.find('binary'), Encoding.find('utf-8')]
f.set_encoding(*args)
show(f, args)
end
```
This behavior is the same from Ruby 2.7.0 to 3.1.2.
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