code: @Trivial
      public PriorityConverter addConverter(PriorityConverter converter) {
          PriorityConverter existing = _addConverter(converter);
  
          if (TraceComponent.isAnyTracingEnabled() && tc.isDebugEnabled()) {
              Tr.debug(tc, "Converter added to map @ priority {0}: {1}={2}", existing.getPriority(), existing.getType(), existing);
          }
  
          return existing;
      }
docs: Add a converter to the map if:
  - there is no existing converter for that type
  - there is an existing converter of equal priority
  - there is an existing converter of lower priority
  
  @param converter the new converter
  @return the new converter if it was added or the existing converter if it was not