Request - grouped by columns available as single values rather than vectors

Would it be possible, within a @by block, to make the grouped by columns available as single values rather then vectors?

In the below, I'd like to create a column of myCurve structs, but because the :name column comes through as a vector, it only works for the myCurve_name_vec structs. I could convert it, it just wouldn't be so clean.

More generally, if you are grouping by a column, any related calculations would likely use that column as a single value.

@with_kw struct myCurve    
    name::Symbol
    curve::Vector{Int64}
end

@with_kw struct myCurve_name_vec
    name::Vector{Symbol}
    curve::Vector{Int64}
end


d = DataFrame( name=[:a,:a,:a,:b,:b,:b], curve =[1,2,3,11,12,13] )

@by d :name   :x = myCurve_with_vec( AsTable(:)... )    #works
@by d :name   :x = myCurve( AsTable(:)... )                   #doesn't work

Start by tracing the @by behavior using the supplied DataFrame example, comparing grouped :name values with the AsTable(:) result. Determine how grouped columns are passed into the requested calculation, then verify that myCurve can receive a single Symbol while existing vector behavior remains supported. Done means the example works with myCurve and related grouped calculations behave consistently.