When using

wrangler deploy

to deploy an update of an existing worker that itself uses KV to cache assets, at what point do the old KV assets get deleted? eg: over the span of a day, 3 updates get pushed via

wrangler deploy

. If I don't use

wrangler delete

, do previous iteration KV assets just fall out due to expiration of TTL or expiration time being reached, or is something also deleting them immediately?