Issue #15948 has been reported by kachick (Kenichi Kamiya).

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Feature #15948: ENV.update takes multiple hashes as Hash#update
https://bugs.ruby-lang.org/issues/15948

* Author: kachick (Kenichi Kamiya)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
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Follow https://bugs.ruby-lang.org/issues/15111
For consistency, I'd like ENV.update takes multiple hashes.

github: https://github.com/ruby/ruby/pull/2248



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