fix: audit sqlx_postgres::types::cube for overflowing casts

Author: abonander

sqlx-postgres/src/lib.rs

@@ -1,6 +1,8 @@
 //! **PostgreSQL** database driver.
+// https://github.com/launchbadge/sqlx/issues/3440
 #![deny(clippy::cast_possible_truncation)]
 #![deny(clippy::cast_possible_wrap)]
+#![deny(clippy::cast_sign_loss)]
 
 #[macro_use]
 extern crate sqlx_core;