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https://issues.apache.org/jira/browse/GROOVY-7608?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14927856#comment-14927856
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Sean Gilligan commented on GROOVY-7608:
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Perhaps this issue will have to wait for 3.0 for a fix, though I'm hoping it
can be fixed in 2.5 or a possible 2.6 and would be willing to help with a fix.
> Comparison of decimal subclasses of Number with == fails
> --------------------------------------------------------
>
> Key: GROOVY-7608
> URL: https://issues.apache.org/jira/browse/GROOVY-7608
> Project: Groovy
> Issue Type: Bug
> Components: groovy-runtime
> Affects Versions: 2.4.4
> Reporter: Sean Gilligan
>
> If I create a subclass of {{Number}} that is implemented internally with a
> decimal value, e.g. using a {{BigDecimal}} even if I implement
> {{compareTo()}}, Groovy will convert my numbers to {{Integer}} before
> comparison.
> {code}
> given:
> def one = MyNumberSubclass.of(1)
> def oneptone = MyNumberSubclass.of(1.1)
> then:
> one == onptone // passes when it shouldn't!
> oneptone == oneptone // fails when it shouldn't!
> {code}
> This is a critical issue for anyone creating a DSL that has custom numeric
> types (e.g. for currency handling) and wants to compare them with {{==}}.
> Specifically this problem occurs with implementations of {{NumberValue}} in
> JSR354 aka *JavaMoney*.
> I can provide some test cases for this if needed and am interesting in
> working to contribute a fix.
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