Problem initializing dataframe column types

General Usage
3

This isn’t about DataFrames, but rather auto-promotion. It looks like Julia promotes the Int[] to Float64[] when you make that array. Try adding an Any

julia> [Int[],Float64[]]
2-element Vector{Vector{Float64}}:
 []
 []

julia> Any[Int[],Float64[]]
2-element Vector{Any}:
 Int64[]
 Float64[]
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