inline fun <R : Any> toAssert(crossinline assertionCreator: Assert<R>.(T) -> Unit): Pair<(Assert<R>.() -> Unit)?, Array<(Assert<R>.() -> Unit)?>>Maps each argument to null if it is already null and if not, then to an AssertionPlantNullable<R>
lambda with receiver by using the given assertionCreator (passing in the argument).
Returns
The mapped arguments.