someone got an compare-chart already available :) ?
more or less questions or what Araq wants for Nimrod
Technically, string mixins are available through the emit macro from the macros module.
The work on type traits have been very recently started and there is a still infant typetraits module. You can keep an eye on its development in the upcoming weeks. It's relatively easy to add new traits so the community can suggest/vote which ones are most important.
Traits are added by simply modifying the evalTypeTrait proc in evals.nim and will usually only require you to study the type-related data structures in ast.nim and the helpers in types.nim, so implementing a trait could be a good starting point for contributors.