Make use of fast HashSet.Contains check #884
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Fixes #883
Moving the typecast up into the if-condition so it can be leveraged for the Contains-check. When the interface is not a
JoinableTaskit can't be in theHashSet<JoinableTask>so you can just skip the branch in this case.Not doing this means there is a type-mismatch between the
HashSet<JoinableTask>and the variable you're checking (IJoinableTaskDependent) which causes C# to pick the LINQEnumerable.Containsextension over theHashSet.Containsmember.