docs: public FEELFnResult<TemporalAmount> invoke(@ParameterName( "from" ) TemporalAmount val) {
          if ( val == null ) {
              return FEELFnResult.ofError(new InvalidParametersEvent(Severity.ERROR, "from", "cannot be null"));
          }
          return FEELFnResult.ofResult( val );
      }