Does anybody know why there's a warning for inlining functions that don't take lambda parameters? Such as

inline operator fun Int?.plus(other: Int?) = if (this != null && other != null) {
    this + other
} else {
    null
}

Let's say I want to use this in places that are called millions of times per second. Wouldn't the

inline

modifier improve performance there as well?

The JVM will most likely inline your call anyway, if it thinks it can profit from doing so. So the expected profit is most likely very small.

Good to know, thank you