@Value
@Builder
class A {
     @Singular("addValue")
     List<String> values;
}

@Value
@Builder
class B {
     Map<String, String> values;
}

@Value
@Builder
class C {
    List<Integer> values;
}

interface CustomMapper {
    A map(B b); // this fails, ideally it can fallback to setter
    A map(C c); // this uses adder

    List<String> map(Map<String, String> map) {
         // custom logic
    }
}