Feature #12953: (Float, Integer, Rational)#round(half: :down)

• Status: Closed
• Assignee: -
• Target version: -

[shyouhei (Shyouhei Urabe)]

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.

[nobu (Nobuyoshi Nakada)]

• Subject changed from (Float, Rational)#round(half: :down) to (Float, Integer, Rational)#round(half: :down)

https://github.com/ruby/ruby/compare/trunk...nobu:feature/round-down

[mrkn (Kenta Murata)]

• Related to Bug #12952: Incompatibility of a method signature between `Float#round` and `BigDecimal#round` added

[shyouhei (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.

[nobu (Nobuyoshi Nakada)]

• Status changed from Open to Closed