'What does (Comparator<T> & Serializable) means?

Today I came to this code in Comparator class on java 15.

public static <T, U extends Comparable<? super U>> Comparator<T> comparing(
        Function<? super T, ? extends U> keyExtractor)
{
    Objects.requireNonNull(keyExtractor);
    return (Comparator<T> & Serializable)
        (c1, c2) -> keyExtractor.apply(c1).compareTo(keyExtractor.apply(c2));
}

I'd like to understand what this means (Comparator<T> & Serializable). Is it a Casting?

javacastingcomparator


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