Issue #10002 has been updated by Martin Drst.

Related to Feature #10085: Add non-ASCII case conversion to String#upcase/downcase/swapcase/capitalize added

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Feature #10002: String swapcase
https://bugs.ruby-lang.org/issues/10002#change-47989

* Author: Andreas Runk
* Status: Open
* Priority: Normal
* Assignee: 
* Category: 
* Target version: 
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Hi, the ruby version 2.1.2 has a problem with the .swapcase function and german letters. 
E.g. `"".swapcase` does return "" but should be "". 



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