Aren't updater functions in state an antipattern?

In documentation here:
https://reactjs.org/docs/context.html#updating-context-from-a-nested-component

An updater function is placed directly in the state object for the sole purpose of passing it down through context:

this.state = {
  theme: themes.light,
  toggleTheme: this.toggleTheme,
};

This seems like an odd antipattern. I've never placed a method in state before. Shouldn't state be exclusively for properties that affect rendering and change over time?

审阅链接的 React Context 文档，尤其是“Updating Context from a Nested Component”部分及其中的 updater-in-state 示例。确定该示例是否需要澄清或修改，并在文档对这一模式给出清晰且达成共识的解释后，视为工作完成。