docs: public JCommander findCommandByAlias(String commandOrAlias) {
          ProgramName progName = findProgramName(commandOrAlias);
          if (progName == null) {
              return null;
          }
          JCommander jc = findCommand(progName);
          if (jc == null) {
              throw new IllegalStateException(
                      "There appears to be inconsistency in the internal command database. " +
                              " This is likely a bug. Please report.");
          }
          return jc;
      }