JuliaData / DataFrames.jl / 3640

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Generalize optimized categorical grouping method to multiple keys (#1674)

The compiler is still able to generate efficient code specialized on the
number of keys. Also require groups !== nothing for this method since
we never call it without groups and it cannot compute the actual
number of nonempty groups without doing all the work anyway.

Also fix a bug with the groups field with sort=true or skipmissing=true.
Make tests stricter to catch it.

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