2023-09-25 ジェネリクス入門 https://typescriptbook.jp/reference/generics 文脈1 https://x.com/kmizu/status/1706137270481531384?s=46&t=O0XT4sYlD-vGDk8sgTgTMA 文脈2 https://x.com/suin/status/1706179659883569592?s=46&t=O0XT4sYlD-vGDk8sgTgTMA