Keep in mind that the version of solidity used, despite being greater than 0.8, does not prevent integer overflows during casting, it only does so in mathematical operations.
In the case that feed.decimals() returns 18, and the token is more than 18 decimals, the following subtraction will cause an underflow, denying the oracle service.
All pairs have 8 decimals except the ETH pairs, so a token with 19 decimals in ETH, will fault.
