feat(precompile-utils): implement helper methods

precompiles/src/solidity/codec/bytes.rs

@@ -53,7 +53,7 @@ impl Kind for StringKind {
 /// The `bytes/string` type of Solidity.
 /// It is different from `Vec<u8>` which will be serialized with padding for each `u8` element
 /// of the array, while `Bytes` is tightly packed.
-#[derive(Debug, Eq, PartialEq)]
+#[derive(Debug)]
 pub struct BoundedBytesString<K, S> {
 	data: Vec<u8>,
 	_phantom: PhantomData<(K, S)>,
@@ -68,6 +68,20 @@ impl<K: Kind, S: Get<u32>> Clone for BoundedBytesString<K, S> {
 	}
 }
 
+impl<K1, S1, K2, S2> PartialEq<BoundedBytesString<K2, S2>> for BoundedBytesString<K1, S1> {
+	fn eq(&self, other: &BoundedBytesString<K2, S2>) -> bool {
+		self.data.eq(&other.data)
+	}
+}
+
+impl<K, S> Eq for BoundedBytesString<K, S> {}
+
+impl<K, S> Default for BoundedBytesString<K, S> {
+	fn default() -> Self {
+		Vec::default().into()
+	}
+}
+
 impl<K, S: Get<u32>> BoundedBytesString<K, S> {
 	pub fn as_bytes(&self) -> &[u8] {
 		&self.data

precompiles/src/solidity/codec/native.rs

@@ -380,3 +380,18 @@ impl<T, S> From<BoundedVec<T, S>> for Vec<T> {
 		value.inner
 	}
 }
+
+impl<T, S> Default for BoundedVec<T, S> {
+	fn default() -> Self {
+		Self {
+			inner: Default::default(),
+			_phantom: PhantomData,
+		}
+	}
+}
+
+impl<T, S> BoundedVec<T, S> {
+	pub fn len(&self) -> usize {
+		self.inner.len()
+	}
+}