mapKeys

inline fun <K, V, L> KoneMap<out K, V>.mapKeys(    keyEquality: Equality<L> = defaultEquality(),     keyHashing: Hashing<L>? = null,     keyOrder: Order<L>? = null,     transform: (KoneMapEntry<K, V>) -> L,     resolve: (key: L, currentValue: V, newValue: V) -> V): KoneMap<L, V>(source)