I saw byte code for

val variable = 90

and in the decompiled bytecode it produced

int variable = true;

. I don't understand this ?

Well the

90

is in the bytecode, so it's not actually optimized away.

Huh, you're right.

This is a decompiler 🤷 It may be buggy, especially with Kotlin, if it's easy to reproduce you can report on Kotlin issue tracker

He could be using those standard functions.

standard functions ?