code: @SuppressWarnings("unchecked")
      @Override
      public final <T> T get(final IKey<T> key) {
          T value = (T) config.get(key.key());
  
          return value != null ? value : key.getDefaultValue();
      }
docs: returns the value for the given key. If no value is set, the
  default value will be returned.
  
  @param key The key to read.
  @return the value.