fix: make from_str parse 0x-prefixed strings

ethereum-types/src/hash.rs

@@ -134,6 +134,11 @@ mod tests {
 		}
 	}
 
+	#[test]
+	fn test_parse_0x() {
+		assert!("0x0000000000000000000000000000000000000000000000000000000000000000".parse::<H256>().is_ok())
+    }
+
 	#[test]
 	fn test_serialize_invalid() {
 		assert!(ser::from_str::<H256>("\"0x000000000000000000000000000000000000000000000000000000000000000\"")

fixed-hash/src/hash.rs

@@ -588,6 +588,11 @@ macro_rules! impl_rustc_hex_for_fixed_hash {
 			/// - When encountering invalid non hex-digits
 			/// - Upon empty string input or invalid input length in general
 			fn from_str(input: &str) -> $crate::core_::result::Result<$name, $crate::rustc_hex::FromHexError> {
+                let input = if input.starts_with("0x") {
+                    &input[2..]
+                } else {
+                    input
+                };
 				let mut iter = $crate::rustc_hex::FromHexIter::new(input);
 				let mut result = Self::zero();
 				for byte in result.as_mut() {