@Nullable
    @Contract(value = "null -> null; !null -> !null", pure = true)
    public static Comparator<Runnable> unwrap(@Nullable Comparator<Runnable> comparator) {
        if (!isTtlRunnableUnwrapComparator(comparator)) return comparator;

        return ((TtlUnwrapComparator<Runnable>) comparator).unwrap();
    }
Unwrap {@code TtlRunnableUnwrapComparator} to the original/underneath {@code Comparator<Runnable>}.

@see #getTtlRunnableUnwrapComparator(Comparator)
@see #getTtlRunnableUnwrapComparatorForComparableRunnable()
@see #isTtlRunnableUnwrapComparator(Comparator)
@see com.alibaba.ttl.TtlUnwrap#unwrap(Object)
@since 2.12.3
ttl2-compatible/src/main/java/com/alibaba/ttl/threadpool/TtlExecutors.java