data class KeyWithValueCreator<out K, V : Any> (source)
Parameter object to express a key/value Pair whose value type is a nullable lambda with an
Expect receiver, which means one can either pass a lambda or null.
Use the function keyValue(x) { ... } to create this representation.
val key: K | 
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val valueAssertionCreatorOrNull: (Expect<V>.() -> Unit)? | 
fun toPair(): Pair<K, (Expect<V>.() -> Unit)?> | 
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fun toString(): String |