Deny overflowing (and lossy) integer type cast operations (#1895)

* Deny overflowing (and lossy) integer type cast operations

* Update docs

CHANGELOG.md

@@ -6,6 +6,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 [Unreleased]
 
+### Added
+- Deny overflowing (and lossy) integer type cast operations - [#1895](https://github.com/use-ink/cargo-contract/pull/1895)
+
 ### Changed
 - Target `pallet-revive` instead of `pallet-contracts` - [#1851](https://github.com/use-ink/cargo-contract/pull/1851)
 

crates/build/src/lib.rs

@@ -504,9 +504,14 @@ fn exec_cargo_clippy(crate_metadata: &CrateMetadata, verbosity: Verbosity) -> Re
         "--all-features",
         // customize clippy lints after the "--"
         "--",
-        // this is a hard error because we want to guarantee that implicit overflows
-        // never happen
+        // these are hard errors because we want to guarantee that implicit overflows
+        // and lossy integer conversions never happen
+        // See https://github.com/use-ink/cargo-contract/pull/1190
         "-Dclippy::arithmetic_side_effects",
+        // See https://github.com/use-ink/cargo-contract/pull/1895
+        "-Dclippy::cast_possible_truncation",
+        "-Dclippy::cast_possible_wrap",
+        "-Dclippy::cast_sign_loss",
     ];
     // we execute clippy with the plain manifest no temp dir required
     execute_cargo(util::cargo_cmd(