Note that v1.4.0 has a hardfork, which will be activated at block height 13,685,401 (ETA is 10/11/2021 around 10pm UTC) on IoTeX mainnet.
- Incorporated the fix for the consensus bug that caused the minority chain split on Ethereum at Aug 17, 2021
- More detailed error reporting for contract execution failure
- Improved block sync speed by setting the proper target range
- Fixed API gas estimation inconsistency by honoring the input's gas limit
and price