Question for @soywiz: why are all the easings in Easing.kt in a hidden object and not in an enum?

Seems like

interface Easing {
    operator fun invoke(it: Double): Double
}
enum class Easings : Easing {
    LINEAR {
        override fun invoke(it: Double) = it
    }
    // etc
}

should work great, no?

While working on https://github.com/korlibs/korma/pull/42 I thought it'd be nice to have a test case that iterated over all the easings to perform some basic assertions on them, but the current structure makes this difficult.