Issue #15947 has been reported by kachick (Kenichi Kamiya).

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Feature #15947: ENV.merge!
https://bugs.ruby-lang.org/issues/15947

* Author: kachick (Kenichi Kamiya)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
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ENV basically has hash like methods.
So I would like to apply an alias `ENV.merge!` that behavior is same as `ENV.update`.

github: https://github.com/ruby/ruby/pull/2246



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