eip712_encode_hash encode string bytes and string uint256

[moisses89]

What is needed?

String bytes feature

I would like that eip712_encode_hash encode string bytes also like the following example:
"Message": [ {"name": "oneByte", "type": "bytes1"} ] "message": {"oneByte": "0x01"}

Currently this is not possible because eip712_encode_hash is using eth_abi that expects python bytes.

String uint256 feature

I would like that eip712_encode_hash encode string uint also like the following example:
"Message": [ {"name": "stringNum", "type": "uint256"} ] "message": {"stringNum": "1234"}

Possible solution

Check in _encode_field(name, typ, value) if is bytes type the value is an instance of str and in that case convert to bytes bytes.fromhex(string).
Similar solution for uint but converting it from string to python int.

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