Why doesn't UInt have a toDouble()?

This appears to be coming in 1.3.30, according to this YouTrack request.

1.3.30 was just recently tagged and appears to be releasing very shortly.

Is UInt not considered a number type?

Yes, it doesn't extend Number class.

Declaration of Int:

class Int : Number, Comparable<Int>

Declaration of UInt:

inline class UInt : Comparable<UInt>

Starting with Kotlin version 1.3.30 UInt has toFloat and toDouble methods.

Related