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https://issues.apache.org/jira/browse/GROOVY-7847?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15326394#comment-15326394
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Paul King commented on GROOVY-7847:
-----------------------------------
Yes, we treat Strings as (loosely) lists of chars for some scenarios but not
all. This is one of the currently unsupported cases. We were going to add more
support, e.g. see GROOVY-7432, but there are numerous tricky edge cases and we
currently just encourage calling toSet or toList and then applying various
subsequent methods.
> Set casting from CharSequence yields invalid Set
> ------------------------------------------------
>
> Key: GROOVY-7847
> URL: https://issues.apache.org/jira/browse/GROOVY-7847
> Project: Groovy
> Issue Type: Bug
> Reporter: Dario Bertini
> Priority: Minor
>
> groovy:000> 'abcc'.toSet() == ('abcc' as Set)
> ===> false
> groovy:000> 'abcc' as Set
> ===> [a, b, c, c]
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