Bug 15960 – SetUnion should filter duplicates

Have a look at http://en.cppreference.com/w/cpp/algorithm/merge http://en.cppreference.com/w/cpp/algorithm/set_union tl;dr: SetUnion should filter for duplicates "The difference between these two algorithms is with handling values from both input ranges which compare equivalent (see notes on LessThanComparable). If any equivalent values appeared n times in the first range and m times in the second, std::merge would output all n+m occurrences whereas std::set_union would output std::max(n, m) ones only" ``` [1,2].merge([1,3]) == [1,1,2,3] [1,2].setUnion([1,3]) == [1,2,3] ```

Commits pushed to master 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 fix issue 15960 - deprecate setUnion in favor of merge

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