Nothing is preventing you from using it this way ? Infix functions are just syntactic sugar, some prefer it, some don't, but there's zero downsides to it (aside

Nothing is preventing you from using it this way ? Infix functions are just syntactic sugar, some prefer it, some don't, but there's zero downsides to it (aside from your coworkers abusing it.) 5 money "USD" is literally the exact same thing as 5.money("USD"), and Int.usd = this.money("USD") + and - are already overloaded (see val subtotal = price + shipping), increase/decreaseBy are for operating over percentages (and could be written as subtotal * (1 - discount), which is much less clear). As the other comment say, it has an actual, real life meaning that people understand clearly. Your price increased by 10 percent. the By convention is also already present in the Kotlin stdlib, although it's more for grouping operations, numeric operations are taking the Of suffix now (sumBy has been deprecated in favor of sumOf, increaseBy could become increaseOf without any loss of clarity)