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https://issues.apache.org/jira/browse/GROOVY-11253?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Paul King closed GROOVY-11253.
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> Identity variants for DGM#countBy
> ---------------------------------
>
> Key: GROOVY-11253
> URL: https://issues.apache.org/jira/browse/GROOVY-11253
> Project: Groovy
> Issue Type: Improvement
> Reporter: Paul King
> Assignee: Paul King
> Priority: Major
> Fix For: 5.0.0-alpha-4
>
>
> We haven't added such functionality in the past since it was thought to be
> more of a niche use case than groupBy (where we do provide it). But given
> this is the closest Groovy has to creating a multiset/bag, it is probably
> worth having as a shortcut - rather than requiring an explicit
> Closure.IDENTITY.
> Whether Groovy should have specialised multiset and multimap classes is
> another question for another issue. We could use ".toMultiset()" to return a
> more specialised multiset return type in that case, so we aren't making it
> harder with this PR to add such functionality later if we wanted.
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