Fix the StorageVec type by excluding the len_cached field from it…

…s type info (#2052)

* Fix StorageVec TypeInfo

* Changelog updated

* Used codec(skip) for len_cached

* Changelog updated

CHANGELOG.md

@@ -6,6 +6,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Fixed
+- Fix the `StorageVec` type by excluding the `len_cached` field from its type info - [#2052](https://github.com/paritytech/ink/pull/2052)
 
 ## Version 5.0.0-rc
 

crates/storage/src/lazy/vec.rs

@@ -117,6 +117,7 @@ pub struct StorageVec<V: Packed, KeyType: StorageKey = AutoKey> {
     ///
     /// Because of caching, never operate on this field directly!
     /// Always use `fn get_len()` an `fn set_len()` instead.
+    #[cfg_attr(feature = "std", codec(skip))]
     len_cached: CachedLen,
     /// We use a [Mapping] to store all elements of the vector.
     /// Each element is living in storage under `&(KeyType::KEY, index)`.
@@ -130,15 +131,6 @@ pub struct StorageVec<V: Packed, KeyType: StorageKey = AutoKey> {
 #[derive(Debug)]
 struct CachedLen(Cell<Option<u32>>);
 
-#[cfg(feature = "std")]
-impl scale_info::TypeInfo for CachedLen {
-    type Identity = Option<u32>;
-
-    fn type_info() -> scale_info::Type {
-        <Self::Identity as scale_info::TypeInfo>::type_info()
-    }
-}
-
 impl<V, KeyType> Default for StorageVec<V, KeyType>
 where
     V: Packed,