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median is broken for "mixed" number types #566

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@cmelchior

Description

@cmelchior

If you have a DataFrame consisting of a mix of Number types, calling median on it will break.

Example:

val df = dataFrameOf("a")(
    1, 
    2L,
    2.0f,
    3.0,
)
df.median("a")

Will throw:

java.lang.ClassCastException: class java.lang.Long cannot be cast to class java.lang.Integer (java.lang.Long and java.lang.Integer are in module java.base of loader 'bootstrap') at java.base/java.lang.Integer.compareTo(Integer.java:59) at org.jetbrains.kotlinx.dataframe.math.MedianKt.quickSelect(median.kt:43)

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