Sync yourls_is_serialized() with its WP counterpart. Also, phpdoc.
Also delete option from cache
Use clone to break object refs. Don't ask.

Stolen from people smarter than me:
- http://core.trac.wordpress.org/changeset/9740
- http://core.trac.wordpress.org/changeset/14777
- http://core.trac.wordpress.org/ticket/13480
Actually use values we escape. Duh.
Comments about that mysterious clone because I'll never remember that in 3 months
Check against api.yourls.org/core/version/1.0/