Add breaking unit tests for expiry time limits.
Fix comment.
Add failing replace with 30 day + expirations.
Add failing add  with 30 day + expirations.
Add CAS unit test to test expiration limits.
Add setMulti unit tests for verifying expiration limits.
Add sanitize_expiration and unit tests.
Remove absint from expiration as this will break timestamps.
Whitespace fix.
Remove absint from expiration as this will break timestamps.
Test against correct replaced value in unit test.
Implement expiration value sanitization.
Merge branch 'expiry-time-limits'