code: @SuppressWarnings("unchecked")
    public <T extends TypedValue> T getVariableTyped(String variableName) {
      TypedValue variable = associationManager.getVariable(variableName);
      return variable != null ? (T) (variable) : null;
    }
docs: @param variableName
  the name of the process variable for which the value is to be
  retrieved
  @return the typed value of the provided process variable or 'null' if no
  such variable is set
  
  @since 7.3