Issue #13799 has been updated by shevegen (Robert A. Heiler).


Interesting.

https://ruby-doc.org/core-2.4.1/ENV.html does not mention #dup so perhaps this comes
from Hash or some other upstream object?

I also can not quite think of a use case for .dup there, perhaps someone can explain
why ENV has it?

On a side note, does anyone know why the documentation above does not mention #dup?


----------------------------------------
Bug #13799: ENV.dup returns a plain Object
https://bugs.ruby-lang.org/issues/13799#change-66132

* 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
----------------------------------------
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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