Forward eachindex and/or Generator to the parent array?

[rafaqz]

This would allow the parent object to set a custom indexing order like DiskArrays.jl does and fix bugs like:
JuliaIO/DiskArrays.jl#185

But @sethaxen I feel like this could break a lot of your work with DimUnitRange?

Probaly the best option is for DD not to do this and for Rasters/YAXArrays etc to be responsible for handling the quirks of DiskArrays.jl chunking, but it would also be nice if it just worked for any AbstractDimArray.