Zoom NON TMS layers

[DrYSG]

In leaflet, is there a way to zoom layers that are not TMS (cloudmade, osm, etc.). One good use of this plug-in is to be able to take a fairly big offline tile cache (in my case, the NASA Blue World) and to scale it to larger sizes, to decrease the memory footprint. Thus in my case I am storing it in IndexedDB (PouchDB) and retrieving it using a FunctionalTileLayer, So I am also curious about merging this with the functional tile layer plug-in.

See a complete write-up and demo of this at: http://gis.stackexchange.com/questions/62070/offline-slippy-map-tiles-database-for-leaflet/62073#62073