[Issue 15960] SetUnion should filter duplicates

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=15960

--- Comment #2 from github-bugzilla at puremagic.com ---
Commits pushed to stable at https://github.com/dlang/phobos

https://github.com/dlang/phobos/commit/501a1d5f41ec980b2b8c67b7a1fc31b6e65991a9
fix issue 15960 - deprecate setUnion in favor of merge

https://github.com/dlang/phobos/commit/5c5dda3dfba0cc859864072b6247f4097b57dd3a
Merge pull request #4249 from wilzbach/fix_15960

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