Sign me up! I'm constantly defining `XYZ` and `PackedXYZ` for memory-bound problems and I have often though it would be nice to be able to do this (in a more ge

Sign me up! I'm constantly defining `XYZ` and `PackedXYZ` for memory-bound problems and I have often though it would be nice to be able to do this (in a more generic way than mere bitfields). It never occurred to me that it could be extended to column stores though.