Signature use at deadlines should be allowed

[hats-bug-reporter[bot]]

Github username: -- Twitter username: -- Submission hash (on-chain): 0xdfcb7680f60a31235951712f2ff8cee290c974857b412632b341454222695d19 Severity: low

Description: Description\ According to EIP-2612, signatures used on exactly the deadline timestamp are supposed to be allowed. While the signature may or may not be used for the exact EIP-2612 use case (transfer approvals), for consistency's sake, all deadlines should follow this semantic. If the timestamp is an expiration rather than a deadline, consider whether it makes more sense to include the expiration timestamp as a valid timestamp, as is done for deadlines.

Instances (3):

File: LMPStrategy.sol

796:                     if (periodFinish > block.timestamp) {

807:                         periodFinish >= block.timestamp + 7 days

808:                             || (hasCredits && periodFinish > block.timestamp + 3 days)