diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 9282e82..1d8fce6 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -1,6 +1,10 @@
 name: test
 
-on: workflow_dispatch
+on:
+  push:
+    branches:
+      - main
+  pull_request:
 
 env:
   FOUNDRY_PROFILE: ci
diff --git a/src/CairoLib.sol b/src/CairoLib.sol
index fafa543..af8f883 100644
--- a/src/CairoLib.sol
+++ b/src/CairoLib.sol
@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: MIT
-pragma solidity >=0.7.0 <0.9.0;
+pragma solidity >=0.8.0 <0.9.0;
 
 library CairoLib {
     /// @dev The Cairo precompile contract's address.
@@ -11,10 +11,10 @@ library CairoLib {
     /// @param contractAddress The address of the Cairo contract.
     /// @param functionSelector The function selector of the Cairo contract function to be called.
     /// @param data The input data for the Cairo contract function.
-    /// @return returnData The return data from the Cairo contract function.
+    /// @return The return data from the Cairo contract function.
     function callCairo(uint256 contractAddress, uint256 functionSelector, uint256[] memory data)
         internal
-        returns (bytes memory returnData)
+        returns (bytes memory)
     {
         bytes memory callData =
             abi.encodeWithSignature("call_contract(uint256,uint256,uint256[])", contractAddress, functionSelector, data);
@@ -22,15 +22,15 @@ library CairoLib {
         (bool success, bytes memory result) = CAIRO_PRECOMPILE_ADDRESS.call(callData);
         require(success, string(abi.encodePacked("CairoLib: call_contract failed with: ", result)));
 
-        returnData = result;
+        return result;
     }
 
     /// @notice Performs a low-level call to a Cairo contract deployed on the Starknet appchain.
     /// @dev Used with intent to modify the state of the Cairo contract.
     /// @param contractAddress The address of the Cairo contract.
     /// @param functionSelector The function selector of the Cairo contract function to be called.
-    /// @return returnData The return data from the Cairo contract function.
-    function callCairo(uint256 contractAddress, uint256 functionSelector) internal returns (bytes memory returnData) {
+    /// @return The return data from the Cairo contract function.
+    function callCairo(uint256 contractAddress, uint256 functionSelector) internal returns (bytes memory) {
         uint256[] memory data = new uint256[](0);
         return callCairo(contractAddress, functionSelector, data);
     }
@@ -38,11 +38,10 @@ library CairoLib {
     /// @notice Performs a low-level call to a Cairo contract deployed on the Starknet appchain.
     /// @dev Used with intent to modify the state of the Cairo contract.
     /// @param functionName The name of the Cairo contract function to be called.
-    ///
-    /// @return returnData The return data from the Cairo contract function.
+    /// @return The return data from the Cairo contract function.
     function callCairo(uint256 contractAddress, string memory functionName, uint256[] memory data)
         internal
-        returns (bytes memory returnData)
+        returns (bytes memory)
     {
         uint256 functionSelector = uint256(keccak256(bytes(functionName))) % 2 ** 250;
         return callCairo(contractAddress, functionSelector, data);
@@ -51,11 +50,8 @@ library CairoLib {
     /// @notice Performs a low-level call to a Cairo contract deployed on the Starknet appchain.
     /// @dev Used with intent to modify the state of the Cairo contract.
     /// @param functionName The name of the Cairo contract function to be called.
-    /// @return returnData The return data from the Cairo contract function.
-    function callCairo(uint256 contractAddress, string memory functionName)
-        internal
-        returns (bytes memory returnData)
-    {
+    /// @return The return data from the Cairo contract function.
+    function callCairo(uint256 contractAddress, string memory functionName) internal returns (bytes memory) {
         uint256[] memory data = new uint256[](0);
         uint256 functionSelector = uint256(keccak256(bytes(functionName))) % 2 ** 250;
         return callCairo(contractAddress, functionSelector, data);
@@ -68,10 +64,10 @@ library CairoLib {
     /// @param contractAddress The address of the Cairo contract.
     /// @param functionSelector The function selector of the Cairo contract function to be called.
     /// @param data The input data for the Cairo contract function.
-    /// @return returnData The return data from the Cairo contract function.
+    /// @return The return data from the Cairo contract function.
     function delegatecallCairo(uint256 contractAddress, uint256 functionSelector, uint256[] memory data)
         internal
-        returns (bytes memory returnData)
+        returns (bytes memory)
     {
         bytes memory callData =
             abi.encodeWithSignature("call_contract(uint256,uint256,uint256[])", contractAddress, functionSelector, data);
@@ -79,7 +75,7 @@ library CairoLib {
         (bool success, bytes memory result) = CAIRO_PRECOMPILE_ADDRESS.delegatecall(callData);
         require(success, string(abi.encodePacked("CairoLib: call_contract failed with: ", result)));
 
-        returnData = result;
+        return result;
     }
 
     /// @notice Performs a low-level delegatecall to a Cairo contract deployed on the Starknet appchain.
@@ -88,11 +84,8 @@ library CairoLib {
     /// callee contract is performed using the `msg.sender` of the calling contract.
     /// @param contractAddress The address of the Cairo contract.
     /// @param functionSelector The function selector of the Cairo contract function to be called.
-    /// @return returnData The return data from the Cairo contract function.
-    function delegatecallCairo(uint256 contractAddress, uint256 functionSelector)
-        internal
-        returns (bytes memory returnData)
-    {
+    /// @return The return data from the Cairo contract function.
+    function delegatecallCairo(uint256 contractAddress, uint256 functionSelector) internal returns (bytes memory) {
         uint256[] memory data = new uint256[](0);
         return delegatecallCairo(contractAddress, functionSelector, data);
     }
@@ -104,10 +97,10 @@ library CairoLib {
     /// @param contractAddress The address of the Cairo contract.
     /// @param functionName The name of the Cairo contract function to be called.
     /// @param data The input data for the Cairo contract function.
-    /// @return returnData The return data from the Cairo contract function.
+    /// @return The return data from the Cairo contract function.
     function delegatecallCairo(uint256 contractAddress, string memory functionName, uint256[] memory data)
         internal
-        returns (bytes memory returnData)
+        returns (bytes memory)
     {
         uint256 functionSelector = uint256(keccak256(bytes(functionName))) % 2 ** 250;
         return delegatecallCairo(contractAddress, functionSelector, data);
@@ -119,11 +112,8 @@ library CairoLib {
     /// callee contract is performed using the `msg.sender` of the calling contract.
     /// @param contractAddress The address of the Cairo contract.
     /// @param functionName The name of the Cairo contract function to be called.
-    /// @return returnData The return data from the Cairo contract function.
-    function delegatecallCairo(uint256 contractAddress, string memory functionName)
-        internal
-        returns (bytes memory returnData)
-    {
+    /// @return The return data from the Cairo contract function.
+    function delegatecallCairo(uint256 contractAddress, string memory functionName) internal returns (bytes memory) {
         uint256[] memory data = new uint256[](0);
         uint256 functionSelector = uint256(keccak256(bytes(functionName))) % 2 ** 250;
         return delegatecallCairo(contractAddress, functionSelector, data);
@@ -134,11 +124,11 @@ library CairoLib {
     /// @param contractAddress The address of the Cairo contract.
     /// @param functionSelector The function selector of the Cairo contract function to be called.
     /// @param data The input data for the Cairo contract function.
-    /// @return returnData The return data from the Cairo contract function.
+    /// @return The return data from the Cairo contract function.
     function staticcallCairo(uint256 contractAddress, uint256 functionSelector, uint256[] memory data)
         internal
         view
-        returns (bytes memory returnData)
+        returns (bytes memory)
     {
         bytes memory callData =
             abi.encodeWithSignature("call_contract(uint256,uint256,uint256[])", contractAddress, functionSelector, data);
@@ -146,19 +136,15 @@ library CairoLib {
         (bool success, bytes memory result) = CAIRO_PRECOMPILE_ADDRESS.staticcall(callData);
         require(success, string(abi.encodePacked("CairoLib: call_contract failed with: ", result)));
 
-        returnData = result;
+        return result;
     }
 
     /// @notice Performs a low-level call to a Cairo contract deployed on the Starknet appchain.
     /// @dev Used with intent to read the state of the Cairo contract.
     /// @param contractAddress The address of the Cairo contract.
     /// @param functionSelector The function selector of the Cairo contract function to be called.
-    /// @return returnData The return data from the Cairo contract function.
-    function staticcallCairo(uint256 contractAddress, uint256 functionSelector)
-        internal
-        view
-        returns (bytes memory returnData)
-    {
+    /// @return The return data from the Cairo contract function.
+    function staticcallCairo(uint256 contractAddress, uint256 functionSelector) internal view returns (bytes memory) {
         uint256[] memory data = new uint256[](0);
         return staticcallCairo(contractAddress, functionSelector, data);
     }
@@ -168,11 +154,11 @@ library CairoLib {
     /// @param contractAddress The address of the Cairo contract.
     /// @param functionName The name of the Cairo contract function to be called.
     /// @param data The input data for the Cairo contract function.
-    /// @return returnData The return data from the Cairo contract function.
+    /// @return The return data from the Cairo contract function.
     function staticcallCairo(uint256 contractAddress, string memory functionName, uint256[] memory data)
         internal
         view
-        returns (bytes memory returnData)
+        returns (bytes memory)
     {
         uint256 functionSelector = uint256(keccak256(bytes(functionName))) % 2 ** 250;
         return staticcallCairo(contractAddress, functionSelector, data);
@@ -182,11 +168,11 @@ library CairoLib {
     /// @dev Used with intent to read the state of the Cairo contract.
     /// @param contractAddress The address of the Cairo contract.
     /// @param functionName The name of the Cairo contract function to be called.
-    /// @return returnData The return data from the Cairo contract function.
+    /// @return The return data from the Cairo contract function.
     function staticcallCairo(uint256 contractAddress, string memory functionName)
         internal
         view
-        returns (bytes memory returnData)
+        returns (bytes memory)
     {
         uint256[] memory data = new uint256[](0);
         uint256 functionSelector = uint256(keccak256(bytes(functionName))) % 2 ** 250;
@@ -205,12 +191,13 @@ library CairoLib {
     /// @dev A ByteArray is represented as:
     /**
      * pub struct ByteArray {
-     *             data: Array<bytes31>,
-     *             pending_word: felt252,
-     *             pending_word_len: usize,
-     *     }
-     *     where `data` is an array of 31-byte packed words, and `pending_word` word of size `pending_word_len`.
-     *
+     *    full_words_len: felt252,
+     *    full_words: [<bytes31>],
+     *    pending_word: felt252,
+     *    pending_word_len: usize,
+     *  }
+     *  where `full_words` is an array of 31-byte packed words, and `pending_word` word of size `pending_word_len`.
+     *  Note that those full words are 32 bytes long, but only 31 bytes are used.
      */
     /// @param data The Cairo representation of the ByteArray serialized to bytes.
     function byteArrayToString(bytes memory data) internal pure returns (string memory) {