Issue #12953 has been updated by Shyouhei Urabe.


We looked at this issue at todays developer meeting and no one (including matz who was there) was against it.  I believe this is accepted.

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Feature #12953: (Float, Integer, Rational)#round(half: :down)
https://bugs.ruby-lang.org/issues/12953#change-61718

* Author: Shyouhei Urabe
* Status: Open
* Priority: Normal
* Assignee: 
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I learned that The Japanese Ministry of Health, Labor and Welfare requires that the insured burden amount of employment insurance be calculated in round half down mode.  Details: http://www.mhlw.go.jp/topics/2005/04/tp0425-2.html

Given there is a real-world situation where half-down is actually mandatory, I think we should implement the (currently lacking) `half: :down` option.



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