String is used instead of BigInt when returning the encoded function parameters

[Muhammad-Altabba]

Is there an existing issue for this?

• I have searched the existing issues

Current Behavior

I think it was planned for 4.x to use BigInt when decoding values.

However, as in this test case, for example, the value return is a string:
https://github.com/ChainSafe/web3.js/blob/7e236d0b3913c08049f4fafd13e1923ee941b2d2/packages/web3-eth-contract/test/integration/contract_methods.test.ts#L49

Steps to Reproduce

Change '10' in the following line to 10n and then run the test:
https://github.com/ChainSafe/web3.js/blob/7e236d0b3913c08049f4fafd13e1923ee941b2d2/packages/web3-eth-contract/test/integration/contract_methods.test.ts#L49

Web3.js Version

4.x

Environment

No response

Anything Else?

No response