Kotlin - Type inference in unsigned type ranges Why does this work (using signed types)... val x = 123 println(x in Byte.MIN_VALUE..Byte.MAX_VALUE) ...but this doesn't (using unsigned types)... val x = 123 println(x in UByte.MIN_VALUE..UByte.MAX_VALUE) Error produced is: Type inference failed. The value of the type parameter T should be mentioned in input types (argument types, receiver type or expected type). Try to specify it explicitly.