@NonNull
    public ObservableDataBuilder<T> contentEquality(@Nullable EqualityFunction<? super T> contentEqualityFunction) {
        mContentEqualityFunction = contentEqualityFunction;
        return this;
    }
@ NonNull public ObservableDataBuilder < T > contentEquality ( @ Nullable EqualityFunction < ? super T > contentEqualityFunction ) { mContentEqualityFunction = contentEqualityFunction ; return this ; }
Defines the function for evaluating whether two objects have the same contents, for the purpose of determining
notifications.
<p>
By default, content equality is evaluated using {@link Object#equals(Object)}.