Issue #13799 has been reported by sylvain.joyeux (Sylvain Joyeux).

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Bug #13799: ENV.dup returns a plain Object
https://bugs.ruby-lang.org/issues/13799

* Author: sylvain.joyeux (Sylvain Joyeux)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: 2.1.9, 2.2.5, 2.3.3, 2.4.1
* Backport: 2.2: UNKNOWN, 2.3: UNKNOWN, 2.4: UNKNOWN
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I was doing ENV.dup to get a copy of the environment that can be modified without affecting ENV. However, ENV.dup returns a plain Object

~~~
irb(main):005:0> ENV.dup
=> #<Object:0x00000002024fc0>
irb(main):006:0> ENV.dup['PATH']
NoMethodError: undefined method `[]' for #<Object:0x000000020446e0>
        from (irb):6
        from /home/doudou/.rbenv/versions/2.4.1/bin/irb:11:in `<main>'
irb(main):007:0> 
~~~

The only way I found to get a copy is Hash[ENV]



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