[ruby-core:102626] [Ruby master Bug#9016] String#encoding is lying?

Issue #9016 has been updated by jeremyevans0 (Jeremy Evans).

Backport deleted (1.9.3: UNKNOWN, 2.0.0: UNKNOWN)
Status changed from Feedback to Closed

As Ruby 3.0 uses UTF-8 for ARGV, this is fixed.

With modified example:

```ruby
puts "Encoding of argument is reported as #{ARGV[0].encoding} and as #{ARGV[0].valid_encoding? ? "valid" : "invalid"}."
puts "Let us inspect the a-tilde argument: #{ARGV[0].dump}"
puts "Let us inspect the a-tilde from UTF-8 source code transcoded into CP850: #{"磚.encode("CP850").dump}"
puts "Let us inspect the a-tilde from UTF-8 source code transcoded into ISO-8859-1: #{"磚.encode("ISO-8859-1").dump}"
```

output is:

```
ruby t.rb 
Encoding of argument is reported as UTF-8 and as valid.
Let us inspect the a-tilde argument: "\u00E3"
Let us inspect the a-tilde from UTF-8 source code transcoded into CP850: "\xC6"
Let us inspect the a-tilde from UTF-8 source code transcoded into ISO-8859-1: "\xE3"
```

----------------------------------------
Bug #9016: String#encoding is lying?
https://bugs.ruby-lang.org/issues/9016#change-90620

* Author: renatosilva (Renato Silva)
* Status: Closed
* Priority: Normal
* Assignee: cruby-windows
* ruby -v: ruby 2.0.0p247 (2013-06-27) [i386-mingw32]
----------------------------------------
Please see attached test case.

If you try opening a file using a CP850 (possibly others) path which was passed as command line argument, you are not able at all, unless you encode the argument into its very own reported encoding (CP850), and from some encoding different than that (in my case, both ISO-8859-1 and Windows-1252 worked). It is just like ARGV[0].encoding is lying!

Before, in Ruby 1.8, File.open would work just fine. I have a script that just stopped working, till I found the above workaround. This seems to me like a bug. I would expect Ruby to just do its best in order to convert user input into the required encodings for file APIs and such. Meaning I would not like for a possible fix to require any code migration from 1.8 to 1.9+ at all.

---Files--------------------------------
encoding-lying.rb (1.04 KB)
encoding-lying-reduced.rb (761 Bytes)


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