Summary:
Fixes T4898. After we increased the strictness of the `%s` conversion, most `serialize()` output is rejected from the cache.
Drop the cache, change the column type to latin1_bin, and then use `%B` to mark the data as binary during query construction.
Test Plan: Viewed Differential, saw cache fills.
Reviewers: btrahan, spicyj
Reviewed By: spicyj
Subscribers: epriestley
Maniphest Tasks: T4898
Differential Revision: https://secure.phabricator.com/D9171
