When a Signer sends a transaction, the TransactionResponse object has a .wait() method. Currently that method rejects a CALL_EXCEPTION if the transaction reverts, otherwise it resolves with the TransactionReceipt, once the transaction is mined, based on its hash.

This feature will enable an additional rejection case, along with a new error in the Logger,, TRANSACTION_REPLACED. This will occur if the transaction is replaced (i.e. the from and nonce match the transaction but the hash is different), with a field indicating the reason for the replacement:

• repriced; the data and to match, but the gas price has changed
• cancelled; the data has been changed to 0x and the to changed to the from
• replaced; any other change

This must occur in a minor version bump.

In v6 we may change repriced to also resolve (instead of reject), but this requires more thought and would not be backwards compatible within v5.