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Both actix_web::web::Data and sqlx::PgPool internally wrap an Arc. Thus, using Data<PgPool> as an extractor in an actix-web route handler results in two Arcs wrapping the data of interest, which isn't ideal. Actix-web 4.9.0 introduced a new web::ThinData extractor for cases like this, where the data is already wrapped in an `Arc` (or is otherwise similarly cheap and sensible to simply clone), which doesn't wrap the inner value in a (second) Arc. Since the new extractor is better suited to the task, suggest it in place of web::Data when giving an example on how to share a pool.