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BigDecimal losses precision in JRuby 1.7.19 #2650

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eljojo opened this issue Mar 5, 2015 · 3 comments
Closed

BigDecimal losses precision in JRuby 1.7.19 #2650

eljojo opened this issue Mar 5, 2015 · 3 comments
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@mkristian
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beginner JRuby 1.7.x stdlib
Milestone
JRuby 1.7.20

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@eljojo
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eljojo commented Mar 5, 2015

Hi,
I noticed there's a loss in precision when using 1.7.19. This is fixed in 9000.
I thought it'd be a good idea to report this anyways.

1.7.19:

$ ruby -v
jruby 1.7.19 (2.0.0p598) 2015-01-29 20786bd on Java HotSpot(TM) 64-Bit Server VM 1.8.0_25-b17 +jit [darwin-x86_64]
$ irb
>> require 'bigdecimal'
=> true
>> BigDecimal.new("10.9", 2).to_f
=> 11.0

9.0.0.0.pre1:

$ ruby -v
jruby 9.0.0.0.pre1 (2.2.0p0) 2015-01-20 d537cab Java HotSpot(TM) 64-Bit Server VM 25.25-b02 on 1.8.0_25-b17 +jit [darwin-x86_64]
$ irb
>> require 'bigdecimal'
=> true
>> BigDecimal.new("10.9", 2).to_f
=> 10.9

MRI 2.2.0:

$ ruby -v
ruby 2.2.0p0 (2014-12-25 revision 49005) [x86_64-darwin14]
$ irb
>> require 'bigdecimal'
=> true
>> BigDecimal.new("10.9", 2).to_f
=> 10.9

I'm running this on mac using OS X 10.10.2 and the JVM:

$ java -version
java version "1.8.0_25"
Java(TM) SE Runtime Environment (build 1.8.0_25-b17)
Java HotSpot(TM) 64-Bit Server VM (build 25.25-b02, mixed mode)
@headius
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headius commented Mar 12, 2015

Hmm...could be a difference in default rounding mode?

@headius
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headius commented Mar 12, 2015

Good beginner bug to sort out exactly why we differ here.

@eljojo
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eljojo commented Mar 12, 2015

I just tested and under 1.7.19, BigDecimal.new("10.4", 2).to_f => 10.0

@mkristian mkristian self-assigned this Mar 16, 2015
mkristian added a commit that referenced this issue Mar 20, 2015
@mkristian
fix the creation of BigDecimal from a String
5f4bb39 
follow what MRI is doing and ignore the precision

fixes #2650

Sponsored by Lookout Inc.
@enebo enebo added this to the JRuby 1.7.20 milestone Apr 28, 2015
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@mkristian mkristian

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beginner JRuby 1.7.x stdlib
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JRuby 1.7.20
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@headius @enebo @rtyler @mkristian @eljojo