From: "ariveira (Alexandre Riveira)" <alexandre@...>
Date: 2014-01-03T10:52:53+09:00
Subject: [ruby-core:59492] [ruby-trunk - Bug #9316] BigDecimal division in	Ruby 2.1


Issue #9316 has been updated by ariveira (Alexandre Riveira).


When upgrading to ruby 2.1 calculate a percentage in our system broke
example


v1 = BigDecimal.new("0.94")
v2 = BigDecimal.new("0.97")
puts (((v2 - v1) * 100) / v1).to_f

ruby 2.0 => 3.191489362
ruby 2.1 => 3.0
----------------------------------------
Bug #9316: BigDecimal division in Ruby 2.1
https://bugs.ruby-lang.org/issues/9316#change-44040

Author: abernardes (Andre Bernardes)
Status: Assigned
Priority: Normal
Assignee: mrkn (Kenta Murata)
Category: lib
Target version: current: 2.2.0
ruby -v: ruby 2.1.0p0 (2013-12-25 revision 44422) [x86_64-darwin13.0]
Backport: 1.9.3: UNKNOWN, 2.0.0: UNKNOWN, 2.1: UNKNOWN


=begin
When updating an app to Ruby 2.1, and I ran into the following difference between ruby 2.0.0-p353 and ruby 2.1.0 when dividing two BigDecimals:

((*Ruby 2.0.0p353:*))
 2.0.0p353 :002 > (BigDecimal.new("1472.0") / BigDecimal.new("0.99")).to_f
  => 1486.868686869

((*Ruby 2.1.0p0:*))
 2.1.0p0 :006 > (BigDecimal.new("1472.0") / BigDecimal.new("0.99")).to_f
  => 1487.0
=end


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