[Suggestion]: Tic-tac-toe tutorial should explicitly explain that mutation causes unreliable re-rendering

Summary

The tutorial's Why immutability is important section doesn't clearly state that mutating state causes unreliable re-rendering behavior.

Page

https://react.dev/learn/tutorial-tic-tac-toe#why-immutability-is-important

Details

While following the tic-tac-toe tutorial, I was confused about why .slice() is necessary. The "Why immutability is important" section talks about time travel features and performance optimizations, but it never explains that mutating the array directly will cause React to not reliably detect the change, meaning the component may not re-render.

It seems as though that is the primary reason the tutorial uses .slice(), but it's not mentioned. I only found this explanation later in the "Updating Objects in State" article. It would be helpful to include this explanation in the tutorial where beginners first encounter the pattern.

リンク先のTic-tac-toeチュートリアルを「Why immutability is important」セクションで開き、参照されている「Updating Objects in State」記事と比較してください。チュートリアルを更新し、直接変更するとReactが変更を確実に検出して再レンダリングすることを妨げる可能性があると説明してから、その説明がslice()、タイムトラベル、パフォーマンスについての既存の議論に適合していることを確認してください。