fun <T> Iterable<T>.noneOrSingle(predicate: (T) -> Boolean): T?
Returns the single element matching the given predicate, or null if element was not found, or throws if more than one element was found.
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fun <T> Iterable<T>.noneOrSingle(): T?
Returns single element, or null if element was not found, or throws if more than one element was found.