[Issue 15401] partialSort should accept two ranges

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=15401
Issue 15401 depends on issue 15421, which changed state.

Issue 15421 Summary: The behaviours of the topNs differ with the bottom
https://issues.dlang.org/show_bug.cgi?id=15421

           What    |Removed                     |Added
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             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED

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