This version is another critical bug fix. In 1.2, if the lookup table is empty then we will re-request the lookup table from the cache on every page request. That could result in several dozen identical cache_get() calls that just burns cycles. This version fixes that. It also switches from require_once() to require(), which should be very slightly faster.
This release fixes a critical bug in 1.1. In earlier versions, the lookup table was rebuilt on every failed lookup on the logic that you're unlikely to actually trigger a lookup unless you actually had data. However, I discovered that was causing dozens of cache_set() calls per page, which is doubleplusungood. This version uses hook_flush_caches() to rebuild the lookup table instead, which is really should have done in the first place.
