abigen: generate function startswith number

[jsvisa]

Rationale

Because of the limit of Golang lang, we can't generate code of this ABI:

[
  {
    "inputs": [],
    "name": "100pct",
    "outputs": [
      {
        "internalType": "uint256",
        "name": "",
        "type": "uint256"
      }
    ],
    "stateMutability": "view",
    "type": "function"
  }
]

abigen will raise error:

// Fatal: Failed to generate ABI binding: 196:29: 'p' exponent requires hexadecimal mantissa (and 10 more errors)

Implementation

Do you have ideas regarding the implementation of this feature? // yes, we can add some rand chars for those non-[a-z] beginning function name
Are you willing to implement this feature? // yes

[s1na]

Was this ABI generated from a Solidity contract? I can see using digits as the first letter is ruled out: https://docs.soliditylang.org/en/v0.8.17/grammar.html#a4.SolidityLexer.Identifier

[jsvisa]

@s1na Thanks for your information, seems a function name that starts with a digit is invalid, but if it starts with _1xxx is valid. eg: _3crv()

[s1na]

Aha yes that indeed is a crasher