issue describing CQ compound class cast exception

CQCompoundIssue.java

import com.googlecode.cqengine.ConcurrentIndexedCollection;
import com.googlecode.cqengine.IndexedCollection;
import com.googlecode.cqengine.attribute.SimpleAttribute;
import com.googlecode.cqengine.index.compound.CompoundIndex;
import com.googlecode.cqengine.query.option.QueryOptions;
import com.googlecode.cqengine.resultset.ResultSet;

import static com.googlecode.cqengine.query.QueryFactory.and;
import static com.googlecode.cqengine.query.QueryFactory.equal;
import static com.googlecode.cqengine.query.QueryFactory.in;
import static com.googlecode.cqengine.query.QueryFactory.or;

/**
 * Created by dsmith on 8/5/16.
 */
public class CQCompoundIssue {

    public static final SimpleAttribute<MyObject, String> A = new SimpleAttribute<MyObject, String>() {
        @Override
        public String getValue(MyObject object, QueryOptions queryOptions) {
            return object.a;
        }
    };

    public static final SimpleAttribute<MyObject, String> B = new SimpleAttribute<MyObject, String>() {
        @Override
        public String getValue(MyObject object, QueryOptions queryOptions) {
            return object.b;
        }
    };

    public static class MyObject {
        private final String a;
        private final String b;

        public MyObject(String a, String b) {
            this.a = a;
            this.b = b;
        }
    }

    public static void main(String[] args) {
        IndexedCollection<MyObject> index = new ConcurrentIndexedCollection<>();
        index.addIndex(CompoundIndex.onAttributes(A, B));

        // breaks with ClassCastException
        final ResultSet<MyObject> retrieve = index.retrieve(and(equal(A, "1"), in(B, "2", "3")));

        // works
        //final ResultSet<MyObject> retrieve = index.retrieve(or(and(equal(A, "1"), equal(B, "2")), and(equal(A, "1"), equal(B, "3"))));

        try {
            retrieve.iterator().forEachRemaining(o -> {});
        } finally {
            retrieve.close();
        }
    }
}