This is ugly:

val thisIsAByte: Byte = getValueFromMagic()
when (thisIsAByte) {
    0x00.toByte() -> LOCKED
    0x01.toByte() -> UNLOCKED
    0x02.toByte() -> UNLOCKED_AND_AUTO_RELOCK_DISABLED
    else -> throw IllegalStateException("Unexpected value for lockState: $it")
}

Hope we will soon be able to get rid of the

toByte()

calls

maybe instead convert thisIsAByte to int

thisIsAByte.toInt()

This is a workaround that quadruples the size in memory (ok, not a big deal where it's used), but I ended up using constants instead since I used them elsewhere. Thanks for the suggestion though!

Are you talking about Kotlin/Native or JVM? Not sure about Native, but on JVM

byte

is just

int

in bytecode, and actually even less efficient, because JVM adds value overflow checks for some operations. The only case when byte is more efficient is arrays