Unsure how to solve error message when applying unstack to DataFrame

General Usage
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2

The error message tells you that two different values in the source data have the same string representation, so they produce duplicates in column names.

Here is a minimal example:

julia> df = DataFrame(x=[0, "0"])
2×1 DataFrame
 Row │ x
     │ Any
─────┼─────
   1 │ 0
   2 │ 0

julia> unstack(df, :x, :x, :x)
ERROR: ArgumentError: Non-unique column names produced. Non equal values in `colkey` were mapped to the same column name.

And the source of the problem is that 0 (number) and string "0" have the same string representation ("0").

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