Don't fail if MV variants have a tuple as default value
Don't fail if MV variants have a tuple as default value

LLNL/spack,iulian787/spack,LLNL/spack,LLNL/spack,iulian787/spack,iulian787/spack,iulian787/spack,LLNL/spack,LLNL/spack,iulian787/spack