Fix conversion of signed constants to unsigned

[sifmelcara]

Signed integer constant cannot be automatically converted to unsigned integer anymore after Kotlin 1.9.0.

See https://youtrack.jetbrains.com/issue/KT-56583 for detail

[JakeWharton]

I had no idea you could use lowercase letters. I think we should always use uppercase because a lowercase L can be mistaken for the number 1.

[JakeWharton]

Although weirdly in reviewing some of my own code I like lowercase f apparently.

Also fun/horrific fact: You can write 1uL as valid Kotlin 😩

[oldergod]

We don't need test to cover that?

[JakeWharton]

It's not a behavior change that can be tested, it's a language change. Before there was an implicit type conversation and now that type conversation either needs to be explicit (toUInt()) or the literal needs changed to the right type (this PR).

[sifmelcara]

Examples in official doc uses lower case u https://kotlinlang.org/docs/unsigned-integer-types.html#unsigned-integers-literals , but I can change it to upper case if you prefer

[JakeWharton]

No. Thanks for the link, though. I'll discuss it somewhere else and won't hold this up any longer. Then maybe we can get enforcement from ktlint.