Issue #6225 has been updated by mame (Yusuke Endoh).

Status changed from Open to Assigned
Assignee set to matz (Yukihiro Matsumoto)

Both String#+ and Array#+ delete no information, but
Hash#merge deletes duplicate fields.
I have heard it is the reason, if I recall.

-- 
Yusuke Endoh <mame / tsg.ne.jp>
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Feature #6225: Hash#+
https://bugs.ruby-lang.org/issues/6225#change-25425

Author: trans (Thomas Sawyer)
Status: Assigned
Priority: Normal
Assignee: matz (Yukihiro Matsumoto)
Category: core
Target version: 2.0.0


Strings and Arrays can be combined with #+. I don't see any reason not to allow Hashes to do so as well.

  class Hash
    alias :+ :merge
  end



-- 
http://bugs.ruby-lang.org/