“in ..” syntax considered harmful?

Unlike my expectation,

converted to

, it seems it is not implemented as what I said.

What I wrote at first was

when(a.compareTo(b)) { in 1..INT.MAX_VALUE -> //do something else -> // do other things }

and I found out

and

consume every CPU power after profiled my code.

After googing I realized kotlin permits operator

or

unlike Java, and the revised one

when { a > b -> // do something else -> // do other things }

makes the program faster dramatically 🙂