[ruby-core:64359] [ruby-trunk - Bug #10132] [Open] unpack() ignores default encoding when generating strings, always uses ASCII-8BIT

Issue #10132 has been reported by mathew murphy.

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Bug #10132: unpack() ignores default encoding when generating strings, always uses ASCII-8BIT
https://bugs.ruby-lang.org/issues/10132

* Author: mathew murphy
* Status: Open
* Priority: Normal
* Assignee: 
* Category: 
* Target version: 
* ruby -v: ruby 2.1.1p76 (2014-02-24 revision 45161) [x86_64-linux]
* Backport: 2.0.0: UNKNOWN, 2.1: UNKNOWN
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New strings are generated in the default encoding:

    irb> __ENCODING__.name
    => "UTF-8"
    irb> "端nicode".encoding.name
    => "UTF-8"

...but not if they're generated by unpack:

    irb> "端nicode".split.pack('M*').unpack('M*').first
    => "\xC3\xBCnicode"
    irb> "端nicode".split.pack('M*').unpack('M*').first.encoding.name
    => "ASCII-8BIT"

Workaround is to force the encoding on every string unpack generates:

    irb> "端nicode".split.pack('M*').unpack('M*').first.force_encoding(__ENCODING__.name)
    => "端nicode"




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