There is a Java function with signature: `public f...

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[mzgreen]

There is a Java function with signature:
public final void writeSparseArray(SparseArray<Object> val)
If I use it in Kotlin then code completion shows me that the parameter has SparseArray<Any!>! type. What is this single !? !! is a documented operator but I can’t have for example val i: Int! = 0 declaration, so what does it mean?