`contract call` to `Accountability.abi` `getValidatorFaults` throws `TypeError`s for JSON serialization and encoding

[cmjc]

Bug Calling the Accountability Contract Interface function getValidatorFaults to a validator with slashing history using aut contract call fails throwing TypeErrors for JSON serialization and encoding.

Expected behaviour The method returns without error, the response being:

• [] if no accusation - this is done
• else Returns an array of Event object(s) of type FaultProof - this is where the error condition is encountered

For example, a call to getValidatorFaults on a validator with slashing history returns so:

aut contract call --address 0x5a443704dd4B594B382c22a083e2BD3090A6feF3 getValidatorFaults 0xaf86859ea7e36f580d2702caeeaf7a79a3838449
TypeError: Object of type bytes is not JSON serializable

During handling of the above exception, another exception occurred:

TypeError: list had unencodable value at index: [0: because (dict had unencodable value at keys: {'rawProof': because (Object of type bytes is not JSON serializable)})]

During handling of the above exception, another exception occurred:

TypeError: Could not encode to JSON: list had unencodable value at index: [0: because (dict had unencodable value at keys: {'rawProof': because (Object of type bytes is not JSON serializable)})]

[szemate]

Fixed by autonity/autonity.py#46.