Constants should be placed as constants and not hardcoded for better readability
Description
Hardcoded values are hard to track and constants should be used instead.
Recommendation
For example in BorrowingVault, 1e18 is used several times for precision, which could be set as a constant such as uint256 private constant PRECISION_CONSTANT = 1e18
Status
Addressed here: Fujicracy/fuji-v2#625