Issue #15044 has been reported by lowang (Przemyslaw Wroblewski).

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Bug #15044: ENV encoding not UTF-8 by default
https://bugs.ruby-lang.org/issues/15044

* Author: lowang (Przemyslaw Wroblewski)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: ruby 2.5.1p57 (2018-03-29 revision 63029) [x86_64-linux]
* Backport: 2.3: UNKNOWN, 2.4: UNKNOWN, 2.5: UNKNOWN
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~~~
$ irb
2.5.1 :001 > 'secret'.encoding
 => #<Encoding:UTF-8>
2.5.1 :002 > ENV['PASS'] = 'secret'; ENV['PASS'].encoding
 => #<Encoding:US-ASCII>
2.5.1 :009 > ENV['PASS'] = ''
 => "\u0141"
2.5.1 :010 > ENV['PASS'].encoding
 => #<Encoding:ASCII-8BIT>
~~~
I would expect all encodings to be **UTF-8** at all times





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