fix: missing EIP-2681 for nonce upper bound

jsontests/src/state.rs

@@ -79,9 +79,7 @@ impl Test {
 				// (0x44), and so for older forks of Ethereum, the threshold value of 2^64 is used to
 				// distinguish between the two: if it's below, the value corresponds to the DIFFICULTY
 				// opcode, otherwise to the PREVRANDAO opcode.
-				let mut buf = [0u8; 32];
-				r.0.to_big_endian(&mut buf);
-				H256(buf)
+				u256_to_h256(r.0)
 			})
 		} else {
 			None

jsontests/src/utils.rs

@@ -12,7 +12,7 @@ pub fn u256_to_h256(u: U256) -> H256 {
 pub fn unwrap_to_account(s: &ethjson::spec::Account) -> MemoryAccount {
 	MemoryAccount {
 		balance: s.balance.clone().unwrap().into(),
-		nonce: s.nonce.clone().unwrap().into(),
+		nonce: s.nonce.unwrap().0.as_u64(),
 		code: s.code.clone().unwrap().into(),
 		storage: s
 			.storage
@@ -48,7 +48,7 @@ pub fn unwrap_to_state(a: &ethjson::spec::State) -> BTreeMap<H160, MemoryAccount
 #[derive(Debug, Clone, PartialEq, Eq)]
 pub struct TrieAccount {
 	/// Nonce of the account.
-	pub nonce: U256,
+	pub nonce: u64,
 	/// Balance of the account.
 	pub balance: U256,
 	/// Storage root of the account.