code: protected final ImmutableList<JClassType> filterSubtypes() {
          if ( isSerializer() ) {
              return CreatorUtils.filterSubtypesForSerialization( logger, configuration, beanInfo.getType() );
          } else {
              return CreatorUtils.filterSubtypesForDeserialization( logger, configuration, beanInfo.getType() );
          }
      }
docs: <p>filterSubtypes</p>
  
  @return the filtered subtypes of the mapped type