maxFeePerGas and maxPriorityFeePerGas have to be given as hex strings

[haltman-at]

Expected behavior

It should be possible to give these fields in the same formats that web3 accepts for other numeric fields (numbers, decimal or hexadecimal numeric strings, BNs, BigNumbers).

Actual behavior

You get an error unless they're given as hex strings. See example in logs below.

Steps to reproduce the behavior

Make any transaction with web3.eth.sendTransaction with either maxFeePerGas or maxPriorityFeePerGas in any format other than a hex string! (E.g. number, decimal numeric string, BN, or BigNumber.)

Logs

Example with Truffle console:

truffle(development)> web3.eth.sendTransaction({ to: it.address, from: accounts[0], data: '0xc0406226', maxFeePerGas: "1" })
Uncaught:
Error: Returned error: invalid argument 0: json: cannot unmarshal hex string without 0x prefix into Go struct field TransactionArgs.maxFeePerGas of type *hexutil.Big
    at XMLHttpRequest._onHttpResponseEnd (/home/sniffnoy/truffle/truffle/node_modules/xhr2-cookies/xml-http-request.ts:345:8)
    at XMLHttpRequest._setReadyState (/home/sniffnoy/truffle/truffle/node_modules/xhr2-cookies/xml-http-request.ts:219:8)
    at XMLHttpRequestEventTarget.dispatchEvent (/home/sniffnoy/truffle/truffle/node_modules/xhr2-cookies/xml-http-request-event-target.ts:44:13)
    at XMLHttpRequest.request.onreadystatechange (/home/sniffnoy/truffle/truffle/node_modules/web3/node_modules/web3-providers-http/lib/index.js:98:13)
    at /home/sniffnoy/truffle/truffle/packages/provider/wrapper.js:107:9
    at /home/sniffnoy/truffle/truffle/node_modules/web3/node_modules/web3-core-requestmanager/lib/index.js:302:36
    at Object.ErrorResponse (/home/sniffnoy/truffle/truffle/node_modules/web3-core-helpers/lib/errors.js:28:19) {
  data: null
}

Environment

NPM: 6.14.11
Node: 12.21.0
web3.js: 1.5.0