code: public <T> T get(String key, Class<T> type) {
          T value = values.get(key, type);
          if (value == null && parent != null) {
              value = parent.get(key, type);
          }
          return value;
      }
docs: Return the value associated with the given key in this scope or any parent scope.
  The value is converted to the given type if necessary using {@link liquibase.util.ObjectUtil#convert(Object, Class)}.
  Returns null if key is not defined in this or any parent scopes.