Hi, I'm new to Kotlin and I have a question about the code snippet from the official doc:

val a: Int = 100

val boxedA: Int? = a

val anotherBoxedA: Int? = a

val b: Int = 10000

val boxedB: Int? = b

val anotherBoxedB: Int? = b

println(boxedA === anotherBoxedA) // true

println(boxedB === anotherBoxedB) // false

Oh, good to know that there is some underlying optimization by JVM