Will likely be picked up in audits as SWC-103 https://swcregistry.io/docs/SWC-103/

As per Solidity 0.8.0, ABI coder v2 is activated by default and as such it does not need to be specified in the code. Disregard this commit if wanting to be explicit in using ABI coder v2  instead of experimental ABIEncoderV2 or abicoder V1.

In `FeeCollector.sol`, `PositionFactory.sol` and `AdminService.sol`, both a fallback() and receive() function are specified. No code is executed in these contracts upon receiving ether, therefore, fallback() can be omitted as it is redundant.